Comcast XFINITY Approved Modems

View the numerous Comcast XFINITY approved modems, but it is easier to look at the list below for the top recommended modems. Three categories (value, WiFi, and DOCSIS 3.1) help to sort the many options for Comcast XFINITY internet services.

Read the Cable Modem Buying Guide to help you choose a modem. Do not forget to purchase your modem accessories.

Internet providers have begun removing some DOCSIS 3.0 modems from their networks. To maximize the years of use from a modem, it is strongly recommended to purchase a DOCSIS 3.1 device (the latest standard).

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Click here to jump to the full Comcast XFINITY approved modem list.

Last Updated: November 1, 2021

Recommended Comcast XFINITY Approved Modems for November 2021

Best Modem Value

NETGEAR CM500 DOCSIS 3.0 Comcast XFINITY Approved Modems
NETGEAR CM500 Cable Modem
Model #NETGEAR CM500
WiFi RouterNo
VoIP Telephone AdapterNo

Best DOCSIS 3.1 Modem

Motorola MB8611 DOCSIS 3.1 Comcast XFINITY Approved Modems
Motorola MB8611 Cable Modem
Model #Motorola MB8611
WiFi RouterNo
VoIP Telephone AdapterNo

Best WiFi Modem

NETGEAR Nighthawk AX6000 CAX80 WiFi 6 Router DOCSIS 3.1 Comcast XFINITY Approved Modems
NETGEAR AX6000 CAX80 WiFi 6 Router DOCSIS 3.1 Cable Modem
WiFi RouterYes (WiFi 6)
VoIP Telephone AdapterNo

Full Comcast XFINITY Approved Modem List

The Modems Listed Below Are All DOCSIS 3.0 Modems Unless Indicated as a DOCSIS 3.1 Modem
♦ Indicates an Intel Puma Chipset Defect – Do Not Buy

Note: ✅ means Yes, ❌ means No

BrandModel #ChannelsVoIPWiFi
ARRISSB6190 ♦32×8
ARRISSBG10 ♦16×4
ARRISSBG6950AC2 ♦16×4
ARRISSBG7400AC2 ♦24×8
ARRISSBG7600AC2 ♦32×8
ARRISSBV3202 ♦32×8
ARRISSVG2482AC ♦24×8
ASUSCM-32 ♦32×8
LinksysCG7500 ♦24×8
LinksysCM3016 ♦16×4
LinksysCM3024 ♦24×8
MotorolaMB8600DOCSIS 3.1
MotorolaMB8611DOCSIS 3.1
MotorolaMG8702DOCSIS 3.1
MotorolaMT7711 24×8
MotorolaMT8733DOCSIS 3.1
NETGEARC6300-100NAS ♦16×4
NETGEARC6300v2 ♦16×4
NETGEARCM700 ♦32×8
SMC NetworksD3CM160416×4
TP-LinkARCHER CR50016×4
TP-LinkARCHER CR70016×4

Channels: first # refers to downstream channels, second # refers to upstream channels (e.g. 16×4, means 16 downstream channels and 4 upstream channels)
DOCSIS 3.1 offers the fastest speeds

VoIP: indicates if the modem has telephone capability

WiFi: indicates if the modem has WiFi capability

Approved Modems Added in August 2017

Approved Modems Added in September 2017

Approved Modems Added in November 2017
Linksys CG6350

Approved Modems Added in December 2017
Motorola MB7621

Approved Modems Added in April 2018
Motorola MG7700

Approved Modems Added in August 2018

Approved Modems Added in October 2018
Motorola MT7711

Approved Modems Added in November 2018

Approved Modems Added in December 2018

Approved Modems Removed in January 2019
Zoom 5341
Zoom 5350
Zoom 5360

Approved Modems Added in February 2019

Approved Modems Added in March 2019

Approved Modems Added in April 2019

Approved Modems Added in August 2019

Approved Modems Added in April 2020

Approved Modems Added in July 2020

Approved Modems Added in August 2020

Approved Modems Added in September 2020
Motorola MG8702

Approved Modems Added in October 2020

Approved Modems Added in November 2020
ARRIS TG862G-CT (removed)
ARRIS TG862R (removed)
ARRIS TM722G (removed)
Zoom 5341J (removed)
Zoom 5345 (removed)
Zoom 5352 (removed)
Zoom 5354 (removed)
Zoom 5363 (removed)
Zoom 5370 (removed)

Approved Modems Added in December 2020
Motorola MB8611

Comcast XFINITY Approved Modems Removed in January 2021
N450 (CG3000Dv2)

Comcast XFINITY Approved Modems Removed in March 2021
Motorola MG7310

Comcast XFINITY Approved Modems Removed in April 2021

Comcast XFINITY Approved Modems Added in May 2021
Hitron CODA

Comcast XFINITY Approved Modems Added in June 2021

Comcast XFINITY Approved Modems Added in July 2021
ARRIS CM820A (removed)
ARRIS SBG6782-AC (removed)
ARRIS SBG7580-AC (removed)
Cisco (Belkin/Linksys) DPC3008 (removed)
Linksys CG6350 (removed)
NETGEAR C3700 (removed)
NETGEAR CM1000 (removed)

Comcast XFINITY Approved Modems Removed in August 2021

Comcast XFINITY Approved Modems Added in September 2021
Motorola MT8733

Comcast XFINITY Approved Modems Removed in October 2021

Comcast XFINITY Company Information

Comcast XFINITY Phone Support: 1-800-XFINITY (1-800-934-6489)

Comcast XFINITY Contact

Comcast XFINITY Chat

Comcast XFINITY Service Centers

Comcast XFINITY Outages

Comcast XFINITY Support

Comcast XFINITY Facebook

Comcast XFINITY Twitter

Comcast XFINITY YouTube

Comcast XFINITY serves the following areas:

New Hampshire
New Jersey
New Mexico
South Carolina
Washington DC
West Virginia

Approved Modems Helpful Resources

Best Wireless Routers for 2021

Free Money Tips

Latest Modem & Router Deals

103 thoughts on “Comcast XFINITY Approved Modems”

  1. I purchased the Arris model SVG2482AC as it is listed in the above reference as one of the approved modems. I called Comcast and requested help to get it connected, I was informed this modem is not compatible with the xfinity and that I needed to return it to get a refund. Why do you have it on your list if it is not compatible?

    • Either Comcast lied to you or you may be in an area that is slower to certify devices for your local network. If you look at the product box in the link below, it states that the SVG2482AC is approved for XFINITY service. In fact, Comcast is the only ISP that has approved this modem/router/voice device.

      The ARRIS SVG2482AC is an approved modem for Comcast XFINITY service. You may want to call again to speak with someone else to try and activate your device. Sorry that Comcast put you through this inconvenience.

    • I’ve been a Comcast/Xfinity customer for more than 20 years. I am also highly technical and know more than ANY tech they can send out or put on the phone. I can assure you that Comcast technicians and engineers are roughly 95% useless. About 5% of the time you will engage with a Comcast employee that knows what they are talking about. I am serious; this has been my experience . I have even had 2nd and 3rd level engineers out to my house to troubleshoot an issue and they were pathetic and never fixed the problem. The last tech they sent out to fix a pixelation issue on one of my televisions actually told me that my signal was “too strong” and that she needed to install an amplifier to “reduce” the signal strength. I was stunned already at that point, but there was more to come. I explained to her that an amplifier would increase the signal strength and that if she wanted to reduce the signal she should install a splitter in line. She held up a splitter that clearly was the standard one input/two outputs splitter which was marked that the outputs attenuated the signal -3..5db each. This would effectively reduce the signal by half, but she argued that the splitter would “increase” the signal and that she needed to reduce the signal strength with an amplifier. I insisted she should investigate this and that not only did the splitter contradict her, but I showed her a website that clearly explained this. She balked and then went out to her work van. About 5 minutes later I walked out and overheard her asking her supervisor if she was correct about the amplifier/splitter functions. HE AGREED! At that point I told her to remove ALL the Comcast DVR’s in the house and cancel my TV service. When the supervisor hasn’t got a clue there is not much more you can expect than disaster. To be honest, I don’t even miss Comcast. I did not get another service and I am saving $2000/year. Some of you that are not technical may not understand this, but what she said and her supervisor agreed with is about the same as saying gas makes your car stop and an empty tank will get you further down the road. For a cable tech to say what they said is utterly unbelievable.

      The point here is do not take what the Comcast/Xfinity representative you spoke with as the last word. These people are STUPID in the extreme. Again, I will say I have met a couple of smart, knowledgeable techs, but that’s a rarity.

      • Thanks, Jack, for sharing your experience. It really is like playing the lottery and winning; on a rare chance, you may actually interact with a competent employee.

      • Similar experience here, but with internet, not speed. It took months, and I actually went to xDSL service for awhile, but eventually I was lured back by the high cable speeds. Four months into our re-subscription, I finally got a guy out that check infrastructure OUTSIDE of my house. What do you know, the node I was on at on one of their terminals was faulty. Comcast has a feathered nest from their near monopoly and just don’t care. But consistent with what “jack” says above, that one guy (about 5%) at cared enough to look further that my service drop. Since then, all has been good. But it’s not like I’ve needed any service from them in quite some time.

  2. Do you know if any new DOCSIS 3.1 modems are expected to hit the retail market any time soon? I’m interested in upgrading to DOCSIS 3.1 (especially since Comcast nearly bricked my DOCSIS 3.0 in April via some “upgrade” to gig, which required us to spend an hour with tech support to partially fix the problems it caused), but if a new gen of 3.1 modems is likely to be released soon, I’d rather wait. Thanks.

    • Sorry, no news on any new next-gen DOCSIS 3.1 modems. Current-gen DOCSIS 3.1 modems are still relatively new (many ISPSs haven’t even upgraded to gigabit speeds yet).

      Keep in mind, most people don’t have access to gigabit speeds (expect that to take a few years to achieve). That really needs to happen first before several generations of DOCSIS 3.1 modems pile up.

      Officially supported DOCSIS 3.1 modems for Comcast XFINITY today are:
      ARRIS SB8200
      Motorola MB8600
      NETGEAR C7800
      NETGEAR CM1000

      • If the Netgear CM100 is officially supported by Comcast, then why in the master list does it have a red X and not the green box with the check mark? The same with the ‘Best Modem Value’ Netgear CM500 which also has a red X.

        The lists are not consistent.

        • Hello Brian.

          The red X and green check boxes refer to VoIP and WiFi capabilities. If a modem is on the master list, then it is approved by the ISP, but it may not have certain features you want (check the purple header at the top of the table). Thanks for the question.

      • I don’t see the ARRIS SB8200 listed above (or in the added/removed section), but I do see the ARRIS SB8300.
        It lists the ARRIS SB8300 as having the defective Puma chipset, but I have read elsewhere that the ARRIS SB8200 has the Broadcom BCM3390 chipset; is that accurate?

        • Correct, Tucker, the ARRIS SB8200 contains the safe Broadcom chipset; the ARRIS SBG8300 contains the bad Intel Puma chipset. In the XFINITY approved modem list, the SB8200 is actually listed in the 5th row (the table is alphabetical based on the number of letters, so SB models get listed before SBG models).

          Thanks for the question, Tucker.

  3. Using one of these Gateways. Will I still be able use the Xfinity (public) wifi hotspot? I sometimes use the hotspot instead of my home network.

  4. You people are either stupid or just flat lying to me and others. You keep telling me my ARRIS svg2482ac 1750G, is not compatible with your system ! Well answer me this ! Why does it have it listed here on ‘your’ list of approved/compatible modem/routers ? I need a good, complete explanation as to why you say it won’t work, why you have it listed as, does so I may inquire with the FCC. I am tired of all this run around. I bought the modem you told me to about a year ago, it’s been working till a few weeks ago, but, now, shows, “wifi not connected” ! Waiting for ASAP response !

    • Sorry, Kenneth, you might be confused. is a site that lists compatible modems for each ISP. This site is not Comcast. If Comcast told you to buy the ARRIS SVG2482AC, that was a big no no. The SVG2482AC contains an Intel Puma chipset which can cause connectivity issues. You can read more about Intel Puma 6 Modem List Chipset Defects at this link.

      You should contact Comcast directly or visit a local service center to hopefully help resolve your issue. At least you got about one year of service out of the device, but Comcast will probably tell you to purchase another modem. In the future, try to only buy non-Intel Puma chipset devices (avoid modems listed on with a black diamond ♦ next to the modem model number – do not buy).

  5. Hello,

    I love the list, but could you either add change the “X” or “check” to “No” or “Yes” or add sorting features? And add the chipset and DOCSIS 3.1 as extra columns. I am looking at various solutions for me.


    • Sorry, Mike, more than half the visitors to this website are on mobile. Adding more and wider columns would make it difficult to read the tables on such small screens. ♦ indicates an Intel Puma chipset. Everything has to be condensed to fit small screens.

      Sorting could be a feature added in the future if it can be done without hurting page load times and search engine readability. Thanks for the feedback, Mike.

  6. I purchased a roku streaming stick + and changed my Xfinity to Internet only, at 100 Mbps which is way more than I need. I’m a bit lost, in trying to determine which modem & router will best suit my needs. I will appreciate your assistance, in directing me. I am not very tech savvy, I therefore ask that you be as direct as possible, with somewhat simplified information. Thank you so very much!

  7. I have a question you can perhaps help me with. Like Tina, I am not very tech savvy. I am buying a new vizio tv that claims to have internet capability. I believe I can simply run the cable from the modem directly to the tv in order to watch netflix. I plan to get xfinity internet-only at 200mbps. What modem will I need? And if I want to be able to have wifi in my apartment, will I also need a router? (I am sorry not to be more knowledgeable or facile with my techno-words.) Thanks!

    • Hello Sarah,

      Most TVs are smart TVs (they can connect to the internet). Yes, you can run an Ethernet cable (usually included with the modem) directly from your modem to your TV. If you don’t have a computer or other devices, WiFi is not needed. If you have more than one device you want to connect to the internet, then you would want a WiFi router. The modem and router you should buy are the same ones recommended to Tina: NETGEAR CM500 Cable Modem and a TP-Link Archer A7 Router.

      If you have any other questions, just ask, Sarah.

  8. I’ve just been informed by Comcast (6/9/20) that the Netgear CM500 is not supported, and they won’t try to connect to one. I live in Daly City CA, if that matters. Sure enough, it doesn’t show up on their “MyDevices” page where compatible modems are listed. They list the CM500-100NAS and the CM500V, but not the plain old CM500 (actually CM500-1AZNAS is the full model name on the box…). This seems awfully weird, but there it is.

    • Dave T.,

      While you are correct, the CM500-1AZNAS is not listed as approved for Comcast, it should be the same modem as the CM500-100NAS. The difference is in the retail packaging:

      CM500-100NAS = regular NETGEAR retail box
      CM500-1AZNAS = Amazon brown frustration-free box

      The modems should be the same. The CM500V adds voice capability.

      The brown box you received should have an XFINITY logo on it. But, you may just be in a region where Comcast won’t activate the NETGEAR CM500 unfortunately. You could ask why your modem box has an XFINITY logo on it if they won’t activate it. Hopefully, you can work it out with Comcast, Dave.

  9. Unbelievable…I came to this site a few weeks ago to find a modem/router combo for my mom. After spending much time I ordered the Motorola MG7315. I hooked it up then called Xfinity to activate it since I couldn’t figure out how to activate it online following the manual. The Xfinity rep told me that this modem isn’t supported. It’s not listed in their system which means they dropped it and that I’d have to return it to Amazon. She also put me on hold to talk with her supervisor to confirm. I then asked her if she could point me to an official list of modems/routers that Xfinity supports. She couldn’t and didn’t even try. She listed a few modems she claims is popular and recommended those to me to which I refused to write down since it’s not what I asked. Well, I guess what I Googled it myself and found, just enter your address or zip code and select a download speed. Then you can filter by brand, docsis version, etc. and right there there’s the Motorola MG7315. Here’s the kicker…. as I’m writing this comment, I literally get a text from Amazon saying that they have refunded my money. =)

    • Yes the Motorola MG7315 is on the official Comcast XFINITY approved modem list.

      The problem with ANY COMPANY is when you talk to a customer rep, you’ll get one answer you may not like. But then get a completely different answer if you call back at a later time to talk to someone else (larger companies are notorious for not having consistent answers from their customer reps). For future reference for those reading this, if you deal with ANY COMPANY and they don’t give you the answer you like, talk to someone else at a different time (maybe wait for a shift change) to hopefully get the answer you are looking for in your situation.

      Sorry, Billy, you had so much trouble with XFINITY’s support. The MG7315 device should have been activated for you (or it should be removed from XFINITY’s approved modem list).

    • Hello Kelsey,

      The NETGEAR C6300-100NAS is actually on the XFINITY approved modem list. In the table above, it was listed as just C6300 (same modem). The table has been updated with the full NETGEAR C6300-100NAS model number. And yes, you should avoid it as it contains the Intel Puma chipset. Thanks for the question, Kelsey.

  10. Hello Modem Gurus,

    I am glad I found this page and hope that you can help. I am about to sign up for service and have the gigablast service, so I am trying to look for a Modem/Router/Voice 3 in 1 that work at that speed. In the list above, I have found 2 (There is a 3rd one but it has the Diamond indicating the chip isssue)

    Motorola MT7711 24×8 1 Gbps ✅ ✅ (Amazon description only says “This product is approved by Comcast for Xfinity Internet and Voice, and recommended by Comcast for XFINITY Internet service speeds up to 400 Mbps.)

    NETGEAR C7100V 24×8 960 Mbps ✅ ✅ (Unfortunately this links to a 400MBPS with voice) on Amazon and the 2000MBPS does not have voice.

    Question: Is there a device that does VOIP/WIFI at the 1000Gigs that is currently the special being offered by Comcast triple play promotion? If not, what is the next best solution

    Thanks in advance for your advice!

    • Sorry, Prasad, there is currently no device that is approved by Comcast that does Modem/Router/Voice 3-in-1 with 1000 Mbps speed. Your option is to get a DOCSIS 3.1 modem with voice to get the speed you require and then buy a separate stand-alone router. Your only option for the modem is the NETGEAR CM1150V and you can combine that with a budget router like the TP-Link Archer A7. If you need more advanced options for WiFi, check out the Best Wireless Routers page.

      Hopefully that helps you, Prasad!

  11. Ok thank you for the FAST reply. As a “non techie” I was coming to the same conclusion but really appreciate the advice. A couple of follow up questions.

    1) How much lower in speed would i need to go in speed to get a 3 in 1? Can you recommend the product?
    2) Will that reduction really matter? I am coming from Frontier and a speed test just performed on my computer shows: Download is 24.9MBPS and upload is 1.9MBPS LOL
    3) If I do go with a seperate router as you mention above, are there any down sides?
    3B) Would it just plug into the modem?

    Thanks again!


    • Prasad, you have two options if you are excluding the speed of DOCSIS 3.1. You can go with the Motorola MT7711 or the NETGEAR C7100V. Both have voice and WiFi included all in one device. The MT7711 Comcast states will be about 864 Mbps, as well as the C7100V. So, it will be close to 1000 Mbps. Speeds are never guaranteed, however.

      The two products mentioned should really be enough for you. Will DOCSIS 3.1 be a bit faster? Yes. But since you would be jumping from 25 Mbps up to around 850 Mbps, that massive jump will feel like “enough” speed. Yes, 1000 Mbps downloading something would be a bit faster, but having over 800 Mbps will be a MASSIVE improvement for you.

      Downsides to a separate modem would be needing to plug in an additional device to the wall and to the modem. Yes, you just plug in the router to the modem (not difficult). The actual setting-up the WiFi is where the challenge may lie. Your device will include a manual or at least online directions for whatever router you choose. You may even have access to a YouTube video to show WiFi setup for your device if words are not as easy to follow.

      Hope that helps you some more. Stay safe, Prasad!

  12. Hello, I’m with comcast triple bundle and switching to either Internet or internet/phone bundle and dropping TV. Looking to buy Motorola MT7711 but my question is if I decided to use another VOIP provider (ie Ooma, Voiply, etc) other than Comcast later on can I still use this Motorola device.

    • Absolutely, Didi. You will still be able to use the Motorola MT7711. You are not tied to phone service from Comcast. You can use another VoIP device with your MT7711 to receive phone service.

  13. Hello. I’ve read several of the comments and still have a couple of questions.

    1. Can anyone advise the fastest internet only option from Xfinity?
    2. With that fastest option, what do I need to buy ( modem and router ) for that option with wi-fi?

    I am attempting to drop everything but internet, and do HuLu live TV. Any suggestions are appreciated. I’m tired of the $240 a month bill.

    • Hello Ashley,

      The fastest internet option could be 1 Gig (1000 Mbps) service depending on your address (bigger cities will likely have this option). If you are going with 1 Gig service, you will need a DOCSIS 3.1 modem. Yes, if you want WiFi, you will need either a stand-alone router and DOCSIS 3.1 modem or a combo DOCSIS 3.1 modem and router device (a couple of options are NETGEAR C7800 or NETGEAR CAX80).

  14. Hello Modem Gurus: Can I continue to use my old & slow ARRIS TM822G telephony modem/router for Comcast telephone service and somehow connect it to a new & fast cable modem such as ARRIS SB8200 for Comcast Internet service plus a separate wireless router? I could swear that Comcast told me several years ago that I could do that any time, but now Comcast is telling me I can’t use more than one modem.

    • If your local Comcast is telling you can’t use more than one modem, then you are stuck with their rules for their network. Some ISPSs do allow the use of more than one modem (connected together with a cable splitter).

      If you need phone service, with a modem and router, why not purchase an all-in-one device like the NETGEAR C7100V or the Motorola MT7711. It might be time for an upgrade.

      Stay safe, John.

  15. I hope you can offer some insight. I’m on round 5 dealing Comcast craziness. I own one of the puma Linksys CM3024. However I have had no determinable issues until “the upgrade”. Everything was working fine for over a year. I asked to have my speed upgraded to gigabit tier. to which the review the equipment and said you’re good, Should notice it take effect within the hour…. The router is fine and is not part of the issue. I’m running a direct connection to my laptop. cat6, gigabit Ethernet port, etc. the next day. Still the speed of the former package. 170ish D- 6 up. yes the up is joke. they seem to think it’s great, but I don’t. So rep 2 argues with me for about 15 mins, pushes some files and bam. 700 D-….6 up. so now I’m getting frustrated. so I bring the modem to the local Xfinity store and give em the story. I reluctantly agree to bring home one of their gateways to test if it’s line coming in to the house. the ones that are less then 20ft to the pole outside and only 4 years old. but again, divert blame. I set it up, and now I have 1200 D – 40 U. (paying for 1000-35). so not the lines. pop the old one back and same old speed. 700-6. So i message them again, to which they say it’s not compatible speed wise and it’s defaulting to the next tier down. What??? A 960 down 24×8 can’t get faster up then 6? I had better up speeds 15 years ago with a docsis 1. So, what’s going here? Bad modem files not provisioned correctly? how can be tech limit at 6? They say it’s not approved, but it’s listed a on their site and it was recommended when I bought it and it’s got their logo on the box, however most of their specs don’t match anything close to what manufacture lists. Do I have to have docsis 3.1 just to get close to 1000 or faster Up then 6? Something seems really off. Please help. Thanks!

    • Jarvis,

      Upload speeds are notoriously slower than download speeds. It is difficult to follow your info here, what device are you currently using? If you are using the Linksys CM3024 the Intel Puma chipset is a major problem and will likely limit your performance for internet connectivity.

      • Sorry for typeos. Yes, it’s a Linksys CM3024. Yes, I’m now very well aware of the puma issues. but as I previous mentioned, I thankfully haven’t had them yet. It’s honestly worked great for gaming, streaming and everything I’ve thrown at it so far. The point is, I’m not getting any consistent or valid info from anyone at Comcast. They have thrown out random theories most of which have proven false. Keep in mind, The 2nd rep I talked to. Said it couldn’t do better then 200Mbps down. 15 mins later of them fumbling I was at 700Mbps down. FYI, paying for 1000 D – 35 U. Not questioning the downstream, Frankly I don’t really need that much anyway. But I’m having a really hard time thinking that a modem that’s listed into triple digits up (“240 Mbps up” via Linksys, yes I know you never hit close to the max), is maxed at “6”? Thus approx .75 per channel? There are many forum posts of people who have a ballpark of, 100-250 down and 10, 20, even 25Mbps up with this model in different states as Xfinity customers. I’m just trying to find answers, I get that most of these Intel chips suck. Personally I never wanted this one to start with, but this was the model they recommended barely a year ago. However, after the Rep admitted the other night it was defaulting to a lower speed package, (700 D – 6 U). I got the feeling there is something I’m not being told. Maybe they don’t have the right modem file to push? Maybe They don’t know how to find the right provisioned files? no idea. But I hoped someone may have some insight to this. And when I buy next modem is it going to be this big of a headache to get close to the speed i’m paying for. Thanks in advance

        From there own site. On the Xfinity CM3024 description page.
        “all Comcast-certified devices on this site will support all Comcast Internet plan upload speeds.”

        • Since you proved with a Comcast-provided device you can achieve the upload and download speeds you are looking for, you know it is not the cable wiring. The only true way to fix a bad Intel Puma chipset modem is to buy a non-Puma chipset modem. You will continue to have issues with it over the next several years if you keep it. A firmware upgrade today may temporarily fix a certain issue, but a later firmware update may introduce new problems.

          If you haven’t read the Intel Puma 6 Modem List Chipset Defects page yet, you should. You really need a new device. ISPs will state they support Intel Puma chipset modems, but if there are connection issues, there is only so much an ISP can do. You really need to upgrade your equipment.

          Good luck, Jarvis!

  16. What modem and wifi router combination device would you recommend for Xfinity’s “Performance Starter (25)” offering? We are located in Georgia. Thanks.

  17. I’m new to Xfinity and am planning to pair a modem (possibly Arris SB8200) with the Google Nest Mesh router and points. Can you please advise if the Arris SB8200 is a solid choice or if there might be another modem that would be better? Thanks!

    • Danny,

      The ARRIS SB8200 would be an excellent choice for a modem (it really is the only good modem ARRIS has; it does not contain the bad Intel Puma chipset). Danny, you can feel confident in a SB8200 purchase.

  18. I have a TP Link Archer AC1750 router. For a triple play I was hoping to use the router and just add on a cable modem. But it looks like the choice for modem only that also has a telephone port is almost as expensive as getting a MT7711. Is the MT7711 my best way to go or am I missing something where I can add a reasonably priced modem only that has a telephone port?

    • Hello Barry,

      Unfortunately with COVID affecting manufacturing (low inventory levels), the best choice for your situation would be the NETGEAR CM500V. You could bookmark the page and see if it ever gets back in-stock, but it has been out of stock for a new device (sold by Amazon) for several weeks. A used modem is not recommended since it may be still registered in the previous user’s ISP account.

      There are some ARRIS modems with voice, but they are slower modems or the faster modems have the dreaded Intel Puma chipset. The recommendation, Barry, is either wait and see if the CM500V comes back in-stock (when sold by Amazon it is normally priced in the $90 to $100 range; don’t overpay the third-party sellers that have a price premium on the product) or the Motorola MT7711 is your next best and cheapest option.

  19. I have a Motorola SURFboard SB6120 purchased in 2011 and a CISCO Linksys EA4500 router, connected to my computer (a fast, recent model HP laptop) via WiFi. I was using Comcast (Xfinity) basic service at 25 Mbps download. Since COVID-19, I’ve been in lots of Zoom meetings and many are of poor quality video/audio, with warnings of low network bandwidth. So I just upgraded to 100 Mbps service. Speedtest shows I am getting about 100 Mbps download and 5 Mbps upload. However, Zoom quality has not improved; if anything, it has gotten worse. I see that you show the SB6120 removed from your list in Jan. 2019; and when I look at the Xfinity list of approved modems, it shows mine as “unsupported” though it says it is compatible with my 100 Mbps service. I have ordered a USB-ethernet adaptor so I can try a direct wired connection to the modem. However, since I get the expected results in speedtest, I don’t expect speed to change; don’t know if there is any other intermittent connectivity or such that might be causing an issue. Any suggestions?

    • The Motorola SB6120 is an end-of-life device with Comcast (it is an old modem model). Be aware it will eventually stop working with Comcast’s network. You should definitely disconnect the router and hardwire your modem to the computer to see if that improves the performance of Zoom (your router may be causing the issue).

      Since you have tested with Speedtest that you are actually getting the speed you are paying for, it may not be your equipment that is causing issues. Your computer may be missing drivers and updates to improve your Zoom performance.

  20. Great site! Very informative but was hoping someone could give me some guidance. One day while on the phone with Comcast/Xfinity they told me they can upgrade my internet speed to 1Gig with my package for free. Sure, let’s do it! Then about 14 months ago I bought a Motorola MT7711 and saved on the monthly modem rental. Had been working great until we started to have some intermittent internet issues over the past few weeks and both of us are getting kicked off our work VPN’s while working from home during the pandemic. Customers are also complaining about the quality of my VOIP business phone calls. I called Comcast and they said they could not see my modem from their end. Then they sent a technician and all he did was verify all the connections were snug. Cable TV works fine never any problems. Then today I called to complain about our internet issues again, the “tech” I spoke to on the phone claimed he could see my modem but started to tell me that the problem was likely my modem because it was rated for 684 mbps and I had 1 gig speed. I told him I would take 684 speed but every internet speed test I ran on my computer showed I was getting between 10 and 200 tops. He said my modem was not compatible with my service and I needed a different modem that was at least 1 gig and that’s why we were experiencing inconsistent quality.

    So my questions are twofold… A) shouldn’t I at least expect to receive 600 mbps with my modem or is he correct that it creates an unstable connection? B) On their website, Comcast/Xfinity does not list one single modem with VOIP that is compatible with 1 gig internet speed. So what am I supposed to do?

    • Me again… Obviously the internet has worked great over the past year+ without the issues that we have experienced only recently, so that leads me to believe the tech with whom I spoke today was dead wrong about my modem. Does anyone want to weigh in?

      • You are correct, Michael, you should be seeing about 600 Mbps internet speed. DOCSIS 3.1 is required for 1 Gig and beyond speeds. There are two modems that don’t contain bad Intel Puma chipsets that are capable of 1 Gig speeds and offers VoIP: the NETGEAR CM1150V and the NETGEAR CM2050V. You will need a separate router if needed.

        You could try a faster modem listed above, but something is not right with your service. Your current modem should be providing faster speeds than what you are receiving. You could try swapping out any cable splitters you are using. Talking to another Comcast rep may be helpful, since you don’t always get the same answer from a large company like Comcast. If they don’t give you the answer you are looking for, it might be time to upgrade your modem (especially since you are paying for speed you can’t achieve with the Motorola MT7711).

        • Hi, is the CM2050V know to have Broadcom chips? What is basis that it does not have the Puma bugged chips? I am looking to get one after losing a CM1050V, and I want to confirm its chips. Netgear support was no help.

          • NETGEAR does not share chipset information to customers. NETGEAR data sheets do not contain any info on the chipsets used in their devices either. There are no known pictures of the chipset inside a NETGEAR CM2050V. The FCC provides this info, but is usually only reserved for WiFi devices. It is assumed the CM2050V is using a Broadcom chipset, because there have not been any mass complaints of latency issues with the modem.

            An option for you, Roger, is to purchase a non-phone multi-Gig modem like the ARRIS S33 or the Motorola MB8611. Both use Broadcom chipsets (S33 proof and MB8611 proof). Motorola (Zoom) has stated they do not use Intel Puma chipsets in any of their modems. You can then combine your modem with an Ooma device (free calling – cheaper service for you).

            Someone may open up a NETGEAR CM2050V to show the chipset inside someday, but the device is limited to Comcast only and due to the cost of the modem, photographic proof may take some time.

  21. Hi all

    When we started working from home this summer, we were having a lot of internet issues so we called Comcast and upgraded our Internet, Phone and TV package. The new bundle gave us 600 MBPS however, we were continuing to have issues so we called Comcast again and they told us we need to upgrade our equipment to Docsis 3.1 from 3.0. I ended up purchasing the Arris Surfboard SB8200 but stupidly didn’t pay attention to the fact that it was just the cable modem. We went to connect it and realized we didn’t have a router. So then I ordered the TP LINK Deco M9 Plus AC220 and we attempted to connect it. We had issues and Comcast informed us that the Arris SB8200 doesn’t work with Voice. So out of frustration and really stuck on what to do, tonight I ordered the Arris Surfboard T25. Then I came across your site which is great but I’m a little confused by the chart. Am I reading correctly that there are no options for us for Voice & Internet that are Docsis 3.1? I just need to get this figured out because we have a few adults working from home and and students on home school and i’m about to lost my mind over trying to figure out this set up. I’m technical enough to know what’s going on but not a networking person so I need some help. Thank you to anyone that can provide some assistance!!!!

    • Unfortunately, there is no DOCSIS 3.1 modem, voice and WiFi router combo approved for Comcast at this time. You can get two of those features in a combo unit for DOCSIS 3.1. Your option should be either a NETGEAR CM1150V or a NETGEAR CM2050V and then use a separate router like the TP-Link Deco M9 Plus Mesh WiFi system you already purchased. The NETGEAR devices are free from the bad Intel Puma chipset that the ARRIS T25 contains.

      The ARRIS TG3452 exists, but it is not certified for Comcast and it contains the defective Puma chipset anyway.

    • You don’t need the cable modem/router or the router with phone ports to use VoIP phones. Just purchase a VoIP adapter from Amazon, eBay, BestBuy ($30-50), etc… and contact your phone company to give you the VoIP settings for their network. Then connect the VoIP adapter to the router, and the phones to the VoIP adapter. You can even use a VoIP adapter compatible with Google Voice (which is free for domestic calls and Canada in US), apply for a Google Voice number (free) and there you are.

  22. Question – If I have a separate cable modem and WiFi router, each with ethernet ports, which is the preferred device to plug in an ethernet cable from a smart TV?

    • If your cable modem only has one ethernet port, that should be connected to your WiFi router already. So, Kevin, using one of your ethernet ports on your WiFi router is the way to go as long as it is giving you a fast enough speed to stream a movie or game online. If not, then you would need to use your modem ethernet connection.

  23. I’m helping an elderly friend. All I need is a modem for xfinity land line phone service. Customer service has not been helpful and I don’t want him renting a modem for $15/ month when I can buy a modem for him that will work

    • Pat, your options are limited. You can purchase a used unit like the ARRIS TM822G or the ARRIS TM822R. Keep in mind that third-party sellers selling pre-owned devices may not have been deactivated from the previous user’s account. It can be frustrating trying to activate a device that is associated with someone else’s account.

      The NETGEAR CM500V can be purchased brand new from a third-party seller for about $154. If you want to buy from an actual certified retailer, Motorola sells the Motorola MT7711 on Amazon for $200. The MT7711 includes a wireless router, but you don’t have to use it.

      Unfortunately, COVID-19 is affecting the availability of some devices like the NETGEAR CM500V. When Amazon was selling the device, it was only $90, but it has not been sold by Amazon as the seller in a few months.

  24. We are snow birds in Florida and are paying $14.00 a month for modem rental with comcast. We don’t have phone service here, we just use our cell phones. What modem can we buy that will work for us? When we have family visit us sometimes there are 2 to 3 laptops on at the same time plus cell phones using the internet. We are not tech savvy at all. Help!!

    • You will need a cable modem and router and the simplest solution for your needs will be the NETGEAR C7000, which is good for speeds up to 400 Mbps. You didn’t state what your internet speed is, so if you need a device that is faster, the Motorola MG8702 will get you up to 1 Gig speeds, Trudy.

      If you already have a router and just need a modem, then the Motorola MB8600 is the best option.

  25. Dave G. Currently, I have an Xfinity modem , Dual Band Wi Fi 802.11ac , XB3 for my land line phone and computer that I rent for $ 14/mo. My computer speed is 200 mbs. I’d like to buy my own modem to avoid the $ 14/mo. charge. I’ve picked out these three new modems: Arris TG862R; Motorola MT7711 and the NETGEAR C7100V. Will any of these work and can I hook it up myself. I’m handy but a novice with electronics.

    Thanks for any guidance you can offer.

  26. I am thinking of purchasing the MOTOROLA MT7711V for my xfinity service. The modem I have now is the ARRIS TG1682G supplied by Comcast. On the Arris modem I can’t change the DNS setting. It’s shaded out. Will I be able to change this setting on the Motorola modem? I would like to use a different DNS for privacy. Also any thoughts on this product would be appreciated. Thanks.

  27. I received an email from Comcast saying they have upgraded my speed from 600 mbps to 800 mbps. No charge but my current modem is too slow for the 800 mbps. This is what got me to find your website. In December 2018 I bought the Arris SVG2482AC which is what I am currently using. I see the info about the bad Intel chipset. My laptop is 9 years old. I do notice that SOMETIMES it seems really slow. This happens every day. I don’t know if it is the bad chipset or just the old computer. I looked to see what other modem I could purchase but we need modem, wifi, and telephone. Comcast list just has this same modem or two others: Motorola MT7711 up to 600 mbps and also Netgear C7100V up to 400 mbps. Do I just resort to paying Comcast $14 each month for their modem? As an FYI- it is just two of us in the house so no more than two devices on at a time. Probably don’t need those higher speeds but it comes with the package. Just did a speedtest and Ping is 17ms, download 130.09 mbps, upload 17.77 mbps. Thanks.

    • Richard, you really need to get a DOCSIS 3.1 modem because your speed keeps increasing. At some point you will go from 800 Mbps to 1000 Mbps with the next free upgrade. Currently, there is no 3-in-1 device for a DOCSIS 3.1 modem, phone and WiFi. Your best option is to purchase either the NETGEAR CM1150V (supports 2000 Mbps and voice) or the NETGEAR CM2050V (supports 2500 Mbps and voice). Then you can combine the modem with a stand-alone router.

      Another option, Richard, is to eliminate the phone service from Comcast and purchase an Ooma device; it offers phone service to your home by using your internet connection. Then, you can purchase a DOCSIS 3.1 modem with WiFi; the Motorola MG8702 would be an excellent choice for you.

      Your laptop may also need an upgraded WiFi adapter to handle these faster speeds if you are using a wireless connection to the PC.

  28. I have a NETGEAR Nighthawk C7000-100NAS new in the box. I cant believe that it is no longer going to work on Comcast. What is going on here?? why are there so many now not working on their network.

    • ISPs have begun the move into DOCSIS 3.1 territory. At the top of all approved modems pages, a recommendation is given to purchase a DOCSIS 3.1 modem to allow more years of use from a modem. The NETGEAR C7000-100NAS was removed from Comcast’s approved modem list in April 2021 because it was likely causing issues with Comcast’s network. Comcast over the last year has begun removing slower modems (like 4-channel and 8-channel download devices) from their approved modem list.

      However, the NETGEAR C7000-100NAS is a 24-channel download modem, so it must be giving customers troubles working properly. Oddly, the NETGEAR C7000v2 is still allowed on the network (for now anyways).

  29. Hi,

    I recently bought a CM1150V auctioned on eBay as a “Used” unit to replace an older and somewhat unreliable modem which was also removed from Xfinity’s approved list not long ago.

    I am not technical. So, nephew tried to help to activate the CM1150V by calling Xfinity.

    Gave Xfinity both the CM MAC address and Serial Number of the CM1150V to Xfinity agent.

    The CM1150V has not yet been connected to our Xfinity coaxial cable as the current/old modem is still connected and in use.

    After verbally verifying and entering the CM MAC address or Serial Number, Xfinity guy said he cannot “find” the modem and said to contact seller to contact Xfinity to have the modem deactivated and removed/disassociated with seller’s Xfinity account. So, I did.

    Seller subsequently contacted Xfinity and was told that the modem is nowhere listed on his account. That Xfinity agent also told him to call Netgear to have them reset the modem as it was already used in another Xfinity account before so that it can be used in another account. Seller confirmed CM1150V was last used on Xfinity 5 months ago.

    Have you heard of that need before to be able to successfully activate a CM1150V (or any modem) previously used on Xfinity?

    What can Netgear possibly remotely do other than ask me to do a factory reset?

    Doing a factory reset is a local action on the CM1150V. Nephew thinks that will not cause any change on Netgear’s and on Xfinity’s sides.

    Is Netgear supposed to contact Xfinity whenever a CM1150V (or any of their modems?) exchanges hands and is to be activated on a different Xfinity account? That sounds utterly inefficient (and seems unnecessary?).

    I appreciate help/pointers from Modem Gurus and fellow users who may have heard/experienced the same in the past (whether with CM1150V or another modem).

    • Buying used modems is not a good idea for this exact reason. has a notification about this at the bottom of every page under the FYI section. Plus, used electronics can be a fire hazard because you have no idea what the previous user or users did to the modem. You will probably not get any help from NETGEAR because this is an issue of the modem being activated already on someone else’s account (it may not even be the seller’s account the device is activated under).

      The suggestion is to return it to the seller, because you can not activate it and purchase a brand new modem. Yes, it will cost more, but you will at least know the condition of the device and it should activate with little trouble. Ideally, a used modem will be deactivated from the previous user’s account when they activate a new modem. But that doesn’t always happen. The previous user may have switched internet providers or passed away or a the internet provider makes a human mistake, etc. Unfortunately, purchasing a used modem involves risk, Kei.

  30. Hi,

    Newbie, my son will be renting an apt in PA which the building uses Xfinity/Comcast. We will sign up for the 400mbps internet only and not rent from them since it cost $14 a month. So we will need a modem wifi router that will work for us but not sure which one will work. Can you point me to a fair price model that’ll work for us? It’s going to be him only and maybe up to 3 devices connected.


    • Your best value option will be the Motorola MG7700 modem router combo unit. Currently, it is priced at $170 at Amazon and you can save $9 by clicking the coupon on the product page, Frankie. The device is capable of wired speeds up to around 850 Mbps, so your son will have room to grow when he upgrades his speed in the future.

      • I just checked, that a Docsis 3.0, I thought we should use 3.1 as you said in one of the thread Comcast is steering away from 3.0. Please advise.

        • Yes, you should definitely target a DOCSIS 3.1 cable modem. You asked for a fair-priced device, but DOCSIS 3.1 is a bit pricier. Yes, the NETGEAR CAX30 would be the next best option for your needs. While the price increases, you do gain some valuable upgrades. The device can handle speed plans up to 2 Gbps (no need to upgrade the modem in the near future). You also gain a WiFi 6 router, as opposed to a WiFi 5 router for the previously mentioned Motorola MG7700. WiFi 6 is backwards compatible with WiFi 5, so if your son is currently only using WiFi 5 devices, everything will still work.

  31. I have Comcast Business and needed phone services. The MT7711 is on the supported devices list. I spoke to three different reps and none of them was able to activate my modem. They all said model MT7711 is not on their list. Perhaps business and residential are different. I’ll stop by the local office and see if they activate it.

  32. Hello,
    I have some questions.
    1. When you state a device is removed (month/year), does that mean it will no longer work with Xfinity?
    My Arris 6580 was working fine one day & suddenly was no longer reliable. The lights would recycle on it like in a continuous reboot loop.
    2. Is that because of the firmware not being able to be updated? Comcast came out & said “it went out. They go out all the time” and rented me a modem. I need to buy my own to save $ in the long run.
    3. Which Netgear wifi cable-modem router can I get for under $50? My internet plan is 100 mbps so don’t need a speed demon.
    4. Should I get docsis 3.1 to be proactive or is 3.0 still going to be around for some time?
    5. Devices on sale from ebay – are they safe to buy or are they sometimes “locked to another person’s account”? If they are, can’t they just be re-associated to my account or is that a real issue to steer clear of? Thanks in advance!

    • Hello James,

      1. New devices won’t be able to activate if they have been removed from the approved modem list. If you already have a device active, it will still work for sometime. It is unknown when it will stop working, so be aware you will eventually need to replace a device that has been removed from Comcast’s network.
      2. Comcast won’t push any new firmware updates to removed devices, because the ARRIS SBG6580 is an old device that no longer receives support from the manufacturer. Your modem may have experienced an electrical surge or just finally gave out.
      3. You won’t get a combo device for under $50. A cheap modem alone is $50. Adding a router to that doubles the cost.
      4. DOCSIS 3.0 will likely be supported by Comcast the longest, but no one know how long that will be (other ISPs will give up on DOCSIS 3.0 sooner, if they haven’t already). Maybe that is two years. Do you really want to buy a DOCSIS 3.0 device for two years of service and then buy a DOCSIS 3.1 device later. Financially, it may make more sense to buy a DOCSIS 3.1 device now and be good for the next decade. Yes, DOCSIS 3.1 is a bit more expensive, but it pays for itself with the rental money you save every month. A recommendation for you, the Motorola MG8702. This DOCSIS 3.1 combo unit is currently on sale at Amazon for $250.

      If you want to go the cheaper route, you purchase a separate router and modem. The NETGEAR CM500 and the TP-Link Archer A7 router is an option. You will likely have better performance from a separate router anyway, as opposed to a integrated router.
      5. Ignore all third-party sellers. With electronics, buy new. You don’t want a fire hazard with a poorly kept device from a third-party seller. Some sellers claim to sell new devices, yet they are actually used or even stolen units. Only buy from reputable sellers like Amazon or Walmart themselves (not third-party sellers). Sometimes an ISP won’t re-associate a device to your account until you contact the previous owner to release the device from their account, which is likely to be hassle for you. Avoid this hassle.

  33. Hello,
    My partner and I are new Xfinity customers and don’t want to pay $14/mo to rent a modem/router. We have their most basic internet service and dont have it connected to phone or TV (we dont have a TV). I’m wanting to buy a cheap/basic DOCSIS 3.0 modem/router but am nervous that they will unauthorize it shortly after I buy it. I looked at the list of authorized/unauthorized devices and it seems like they come and go regularly. Some were removed after only 2 months! Any suggestions about an inexpensive option that should work for long enough to pay itself off?

    This issue is part of the reason why I dont want to buy a DOCSIS 3.1. Seems like a lot of money to spend for Xfinity to pull the rug out from under you. Anyways, whatever advice you have on a cheap modem/router option would be appreciated.


    • Your best option for a cheap modem/router combo unit will be the Motorola MG7540. If you want to use a stand-alone router, which may give you better performance, you can combine the TP-Link Archer A7 with the NETGEAR CM500. Sam, the main advantage of utilizing separate devices is if the modem stops working, you don’t need to replace the whole unit like a modem/router combo device.

      • Hi Gurus – thanks for the quick reply, I really appreciate it. I’m looking at Xfinity’s website and dont see the Netgear CM500 already. I live in Chicago, so I’d think there’d be everything available here that there is elsewhere. Is it possible that it’s not on their website? If I proceed with buying it could I reasonably assume that it would work? (I know you cant make any 100% guarantees)

        • Try looking it up again and look for NETGEAR CM500-100NAS. That is the same as the CM500. It is a really popular modem, so Xfinity should have it listed for your area as approved. Sam, if you still don’t see it listed, you can post your street address with the zip code and research will be done on available modems to purchase in your neighborhood (your street address will not be posted on this website).

  34. Hi there I really love the great advice given on this site. About every 5 years I replace my modem and router * I don’t want to rent*. I have 800d/10up service and use an Orbi RBK50 (1 satalite) router with a surfboard sb6183.(I know this outdated but they just uped the speed to 800 for free😊)
    having the triple play What is your recommendation for upgrading 1) I was looking at using a 3in1 like Motorola MT8733. 2) or using separate devices? I’ve always used separate.
    Which cable modem do you recommend would be good for the next handful of years and what are your thoughts on my router? Was thinking to update that too.

    • The ARRIS SB6183 won’t give you the 800 Mbps speed for your current speed tier. And since Comcast gives free upgrades for speed tiers every so often, you want to upgrade to the fastest modem you can buy. The Motorola MT8733 is your best option for triple-play. It is capable of 2.5 Gig speeds, so you won’t need to upgrade again once you hit 1 Gig speeds and the MT8733 utilizes WiFi 6 technology. Keep in mind, separate devices often give better WiFi performance rather than using an all-in-one device. So if you want to keep your NETGEAR Orbi RBK50 (if there is nothing wrong with it, why replace it), you may purchase a NETGEAR CM2050V (modem & voice), which also supports cable plans up to 2.5 Gbps.


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