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Comcast (Xfinity) Approved DOCSIS 3.0 and DOCSIS 2.0 Cable Modems

Modem list updated December 2016. Prices updated every hour.
Below are all the modems on the Comcast Approved Cable Modem List and that can be bought at Amazon, Walmart or Best Buy. There are over 45 different modems on that list and we've gone through all of them to find the ones that can be purchased at major retailers.

If you're paying $10 a month to rent a modem from Comcast, that's $120 a year or $600 over 5 years. You can buy a new one that will pay for itself in less than one year. Its easy to install. Just hookup modem, open web browser on attached computer and follow the on-screen instructions.

Comcast / Xfinity Triple Play or Voice customers: The modems listed immediately below will not work if you have Comcast/Xfinity Voice or Triple Play. To see modems that will work, read this: Comcast Voice Modems


DOCSIS 3.0 Cable Modems

Cable Modem Buying Tips and FAQ's

Comcast recommends that you buy a DOCSIS 3.0 modem for all of their internet plans. All of these modems below will work on all speed tiers: Economy, Performance, Ultra, Blast! and Extreme. For Extreme 150, choose a modem with at least 8-channel downstream bonding to maximize your speed. They are the ARRIS/Motorola SB6141, SB6183, SB6190, SBG6580, SBG6700, SBG6782, SBG6900, Netgear C3000, CG3000Dv2, C3700, C6300 and Zoom 5354.

Comcast business customers should buy either the ARRIS/Motorola SB6141, SB6190 or the SB6183 for all speed tiers up to and including Deluxe 100 Plus. For the Deluxe 250, only the SB6183 and the SB6190 will maximize your speeds.

All of these modems are high quality and have pretty much the same features, except of course those with routers built in. So don't worry too much about deciding which one to buy. Price should be a main factor in your buying decision. Buy one now and start saving those rental fees!

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ARRIS / Motorola SB6141 SURFBoard DOCSIS 3.0 Cable Modem

The ARRIS / Motorola SB6141 is the updated version of their popular SB6121. It has 8-channel downstream bonding and 4-channel upstream, twice the maximum download speed of the SB6121 (Comcast / Xfinity has put the SB6121 on the end of life, EOL, list.) Not sure which one to buy? Buy this one. The newest version of the SB6141 is the SB6183, which has twice the maximum download speed of the SB6141. Supports IPv6 and IPv4 addressing. Works with Windows, Mac, or Linux computers.

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  • 4.4/5 (27,661 ratings counted at all sellers)

15% of November's visitors who bought a DOCSIS 3.0 modem, bought this one.

ARRIS / Motorola SBG6700-AC DOCSIS 3.0 Cable Modem with AC1600 Wi-Fi Router

The ARRIS / Motorola SBG6700 has a built-in wireless-AC1600 router, for fast WIFI speeds. It also has 2 Gigabit Ethernet Ports. 8-channel downstream, and 4-channel up. A faster version of this is the SBG6900, with twice the maximum download speed and an AC1900 wireless router. Supports IPv6 and IPv4 addressing. Works with Windows, Mac, or Linux computers.

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  • 4.3/5 (8,450 ratings counted at all sellers)

7% of November's visitors who bought a DOCSIS 3.0 modem, bought this one.

ARRIS / Motorola SB6183 SURFBoard DOCSIS 3.0 Cable Modem

The ARRIS / Motorola SB6183 is one of the latest versions in their Surfboard series. With 16-channel downstream bonding and 4-channel upstream, it can handle the fastest internet plans. As the price of this modem has fallen, it's becoming the one to buy to really future-proof yourself as ISP's increase speeds. The newest version of the SB6183 is the SB6190, which has twice the maximum download and upload speed of the SB6183. Supports IPv6 and IPv4 addressing. Works with Windows, Mac, or Linux computers.

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  • 4.6/5 (4,891 ratings counted at all sellers)

17% of November's visitors who bought a DOCSIS 3.0 modem, bought this one.

Netgear N600 WiFi DOCSIS 3.0 Cable Modem Router (C3700)

The Netgear N600 has built-in dual band wireless-N router. If you have devices with dual band too, you can get exceptional WiFi speed. It also has 2 Gigabit Ethernet ports, a USB 2.0 port and 8-channel bonding downstream, 4 upstream. Supports IPv6 and IPv4 addressing. Works with Windows, Mac, or Linux computers.

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  • 4.0/5 (8,101 ratings counted at all sellers)

4% of November's visitors who bought a DOCSIS 3.0 modem, bought this one.

ARRIS / Motorola SB6190 SURFBoard DOCSIS 3.0 Cable Modem

The ARRIS / Motorola SB6190 is the latest version in their Surfboard series. With 32-channel downstream bonding and 8-channel upstream, it can more than handle the fastest internet plans now and into the future. Supports IPv6 and IPv4 addressing. Works with Windows, Mac, or Linux computers.

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  • 4.5/5 (2,903 ratings counted at all sellers)

15% of November's visitors who bought a DOCSIS 3.0 modem, bought this one.

ARRIS / Motorola SBG6900-AC DOCSIS 3.0 Cable Modem with AC1900 Wi-Fi Router

The ARRIS / Motorola SBG6900 is the latest modem from ARRIS/Motorola. It has a built-in wireless-AC1900 router, for the fastest WIFI speeds. It also has 4 Gigabit Ethernet Ports. This is one of the faster modem/router combos that you can buy. 16-channel downstream, and 4-channel up. It also has a USB 2.0 port, so you can add a USB hard drive or flash drive and share files on the network. Supports IPv6 and IPv4 addressing. Works with Windows, Mac, or Linux computers.

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  • 4.5/5 (4,130 ratings counted at all sellers)

12% of November's visitors who bought a DOCSIS 3.0 modem, bought this one.

ARRIS / Motorola SBG6580 SURFboard DOCSIS 3.0 Gateway Wireless Cable Modem

The ARRIS / Motorola SBG6580 has a built-in dual band wireless-N router. It also has 4 Gigabit Ethernet Ports. 8-channel bonding downstream, 4-channel upstream. The newer version is the SBG6700. Supports IPv6 and IPv4 addressing. Works with Windows, Mac, or Linux computers.

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  • 3.9/5 (8,991 ratings counted at all sellers)

12% of November's visitors who bought a DOCSIS 3.0 modem, bought this one.

Netgear AC1750 Wireless-AC DOCSIS 3.0 Cable Modem Router (C6300)

The Netgear AC1750 has a built-in dual band wireless-AC router. With 16-channel bonding downstream, 4 upstream plus the AC router, its one of the fastest wireless modems available. It also has 4 Gigabit Ethernet ports and a USB 2.0 port. Supports IPv6 and IPv4 addressing. Works with Windows, Mac, or Linux computers.

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  • 4.4/5 (4,512 ratings counted at all sellers)

7% of November's visitors who bought a DOCSIS 3.0 modem, bought this one.

Netgear N300 WiFi DOCSIS 3.0 Cable Modem Router (C3000)

The Netgear N300 has a built-in wireless-N router. It has 2 Gigabit Ethernet ports plus a USB 2.0 port for attaching a network drive. 8-channel bonding downstream, with 4-channel upstream. Supports IPv6 and IPv4 addressing. Works with Windows, Mac, or Linux computers.

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  • 4.0/5 (7,062 ratings counted at all sellers)

3% of November's visitors who bought a DOCSIS 3.0 modem, bought this one.

Netgear N450 WiFi DOCSIS 3.0 Cable Modem Router (CG3000Dv2)

The Netgear N450 has built-in wireless-N router, rated at 450 Mbps, faster than the Netgear N300 which is rated at 300 Mbps. It has 4 Gigabit Ethernet ports and a USB 2.0 port. Plenty of speed with 8-channel bonding downstream and 4-channel upstream. Supports IPv6 and IPv4 addressing. Works with Windows, Mac, or Linux computers.

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  • 3.9/5 (5,817 ratings counted at all sellers)

2% of November's visitors who bought a DOCSIS 3.0 modem, bought this one.

Zoom 5354 DOCSIS 3.0 Cable Modem plus Wireless N300 Router

The Zoom 5354 is a cable modem with a built-in N300 wireless-N router. It has 4 Gigabit Ethernet ports, and with 8 channel bonding downstream, should handle any speeds your cable company might provide well into the future. Supports IPv6 and IPv4 addressing. Works with Windows, Mac, or Linux computers.

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  • 4.1/5 (417 ratings counted at all sellers)

2% of November's visitors who bought a DOCSIS 3.0 modem, bought this one.

ARRIS / Motorola SBG6782-AC DOCSIS 3.0 Cable Modem with AC1750 Wi-Fi Router

The ARRIS / Motorola SBG6782 has a built-in wireless-AC1750 router, for some of the fastest WIFI speeds. It also has 4 Gigabit Ethernet Ports. 8-channel downstream, and 4-channel up and is a few inches bigger than other modems. Since this model can be hard to find sometimes, check out the SBG6700 and SBG6900. They are similar. Supports IPv6 and IPv4 addressing. Works with Windows, Mac, or Linux computers.

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  • 4.3/5 (22,481 ratings counted at all sellers)

0% of November's visitors who bought a DOCSIS 3.0 modem, bought this one.

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DOCSIS 2.0 Cable Modems

(Scroll up or click here for DOCSIS 3.0 modems)
Cable Modem Buying Tips and FAQ's

Comcast does not officially support DOCSIS 2.0 modems anymore. These used to work, but we cannot recommend them anymore.

Motorola Surfboard SB5101U DOCSIS 2.0 Cable Modem

The Motorola SB5101U is an updated version of the SB5101. In addition to the Ethernet port, it has a USB port.

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  • (1,013 ratings counted at all sellers)
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Amazon $49.95 $28.61

Motorola Surfboard SBG901 DOCSIS 2.0 Wireless Cable Modem

The Motorola SBG901 has a built-in wireless-G router and has an Ethernet port. We're not a big fan of these modem/router combos, but if you don't need the features of the latest routers, this will work just fine.

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  • (301 ratings counted at all sellers)
SEE IT NOW AT:NEWUSED
Amazon $84.49 $12.00

Comcast Voice or Triple Play Customers:

You will need a cable modem called an EMTA or telephony modem. Not all Comcast regions let you buy your own EMTA modem. Call your local Comcast service center and check if they allow customer owned EMTA modems. If so, the following can be bought from Amazon (these links takes you to Amazon):

These are the only retail modems that will work with Comcast phone service. Many people have bought the Arris TM822G retail version (See at Amazon: Arris TM822G Touchstone DOCSIS 3.0 8x4 Ultra-High Speed Telephony Modem), but Comcast says it might not work now or in the future when they do a firmware update. Here's a link to that discussion on the Comcast forum: Retail TM822G Discussion. We recommend not buying the TM822G and buying one of the others listed above instead.

The TM722g has 4-channel downstream while the TG862G has 8. If you don't need the built in WIFI router of the TG862G, you can put it in bridge mode and use your own WIFI router. Please call Comcast before purchasing any EMTA modem to save lots of headaches and troubles.

Another option is get rid of Comcast Voice and sign up with a voice over IP (VoIP) company such as Callcentric. For $3.45 per month plus 1.5 cents per minute (other pricing plans available), you can use your current phone number, get free voice mail, caller id, forward your messages to your email, automatic spam / telemarketing call blocking, message text alerts, block and forward certain calls, 911 service; all the features of Comcast Voice plus many more. Quality is as good as Comcast's. If you don't use your home phone much anymore, this is a great option. Now, you could buy your own modem and save even more per month. We've been using Callcentric for almost 5 years now and absolutely love it.
How we set-up Callcentric plus more information

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Comments

Full StarFull StarFull StarHalf StarEmpty Star 3.5 (21)
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Ray (Herriman) says...
I do have phone service bundled with my internet, however only because there was a deal for the bundle. But I do not even use the land line - I'm all mobile. So I don't care if the phone service works, only if the modem will still work. It is a NetGear CM600, which is DOCSIS 3.0. Can anyone confirm either way?
23rd October 2016 11:02pm
Dan says...
My understanding is Comcast won't let you use a modem without telephone capabilities if you have their phone service. See potatoguy's and sonofzell's comments a few comments below this one. So you'd either have to dump the phone service or buy a telephone ready (EMTA) modem. Those are listed here: Comcast Voice Modems. If anybody has heard differently or gotten it to work, please let us know.
25th October 2016 4:09pm
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Margaret Bateman (Yarmouthport) says...
I want to replace my Arris TG872 modem that I am leasing from Comcast. I'm thinking of SB6141 as my speed is going to be lowered from Blast. Your thoughts or suggestions? Thank you.
5th October 2016 12:35pm
Dan says...
I don't think there is an ARRIS TG872. If you meant the TG862, then the SB6141 will be fine. But if you still have phone service with Comcast, the SB6141 will not work. More phone service modem info here: Comcast Voice Modems
5th October 2016 9:42pm
MELINDA DOWNING (Alameda) says...
If I buy the Arris 722 modem (used off Amazon: Arris Tm722g Cable Modem Docsis 3.0 ) for use with Comcast internet & voice, what is the best router to get to use with it for my WiFi capability.
5th September 2016 3:46pm
John Steinbach (Lockport) says...
I had a modem with 4 phone lines that is nearing it's end of life. I have a home office with house line, office line & fax line. I'm NOT a business, just work from home & my employer requires the separate phone/fax lines. Can't find a modem with 4 voice lines & Comcast said they only rent them to business customers.
31st August 2016 5:10pm
potatoguy says...
Can I get a voiceless modem if I'm paying for voice/internet? I just want the internet to work.
19th August 2016 6:45pm
sonofzell (Philadlephia) says...
Sadly, no. I purchased the Netgear AC1750 (which worked BRILLIANTLY!), and was promptly shut-down by Comcast.

They claim it is a liability issue to not have a voice modem if you're paying for the service.

I'm now relegated to the Arris TG862G/CT which, in terms of wifi, is about as useful as placing a brick on my desk.

I've been exhaustively searching for a replacement and have just come to terms with having to just buy a decent router to put in front of the Arris. I'll have spent close to $400 when all is done, but I haven't found any other alternative.

25th August 2016 2:43pm
Waffle (Orlando) says...
We are looking into switching from AT&T U-Verse to X1 Preferred Plus Triple Play with digital voice and up to 150 Mbps downstream. Would it be possible to purchase a modem and a WiFi router that is approved by Comcast for one voice line and the 150 Mbps download speeds? Would we be able to expect down speeds of at least 50 Mbps on two wired connections and 40 Mbps on wireless connections? I was looking at the TG862G/CT and TM722G from ARRIS for modems and the AC1900 Nighthawk WiFi Range Extender from Netgear. Would any of these be able to match the performance of rented equipment?
18th August 2016 3:22pm
Dan says...
You'd want to go with the TG862G/CT (8 download channels) over the TM722G (4 download channels). The latter would have trouble at 150 Mbps, if it could even do it. You could easily get the 2 wired connections to go 50 Mbps.

As for the wireless connection, that's going to depend on interference, wall construction, distance from the extender and other things that affect wifi performance. The TG862G/CT has wireless-N wifi while that extender has wireless-AC. It will work, but you won't get wireless-AC speeds. You should be able to get 40 Mbps, but the factors I listed above might reduce that. If its not fast enough, you could try putting the TG862G into bridge mode and buy a separate wireless-AC router and plug that into the TG862G.

18th August 2016 8:05pm
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Traci (Memphis) says...
I just want to keep following this stream for current postings. Thanks for all the info. I am trying to select modems and/or routers for both work and home environments all with different situations (current att want Comcast, have Comcast would like to improve, some with triple play, possibly look to have internet only, etc.). Please keep the recommendations coming.
18th August 2016 12:31pm
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Walt (Elmwood Park Il) says...
I am greenhorn in the field. Comcast rents me xfinity Dual-Band WiFi 802.11ac XB3. Please recommend compatible one I can buy to return the rented one. Or any other advices how to do the job myself.
Thanks Walt. Please answer to my email
13th August 2016 12:05am
Dan says...
As of now, there is no modem that you can buy with the same capabilities as your current XB3 modem. Your current modem has voice, at least 16 download channels and wireless-AC. The only voice modem currently available to buy has 8 download channels and and wireless-N. Don't know if that would be fast enough for you, but you can see more info here: Comcast Voice or Triple Play Modems
15th August 2016 3:46pm
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Sara (Decaatur) says...
I have Triple Play and have Xfinity router/modem. Went to Best Buy and looking at purchasing new computer and they are recommending I go with new router with AC capability. When I called local Comcast they said I could certainly buy my own and referred me to this website. I called Best Buy and told him what it says. He said I could go with AC router and separate modem. Does that sound right?
22nd July 2016 2:34pm
Dan says...
That is right. I prefer to have a separate modem and a router. While for most basic users the combined units are fine, having separate devices allows you to upgrade your router easily if needed plus the stand alone routers tend to have more features and work better.
26th July 2016 2:26pm
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trevis scott (Atlanta) says...
What modem would you recommend if you want to use the separate router and modem? I have Triple play with phone service. I really don't want with the all in one modem/router.
31st July 2016 2:32pm
Dan says...
If you have Triple Play, you don't have many options at this time. You can try to find an Arris TM722G (no built-in router), but they are hard to find. Or you can buy the Arris TG862G (with built-in router) and either try the built-in WIFI router or put it in bridge mode and use your own WIFi router instead.
1st August 2016 11:57am
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kathleen w (Dothan Al) says...
I bought 2 modems ,spent all day installing /un installing them,they did not work,the man at the local office said you can't buy any that works with Comcast,let me know if anyone has the right info on the above,thanks.
1st June 2016 10:07am
Dan says...
If its a modem with telephone capabilities, that could be true. Some Comcast regions don't allow customers to buy and install them. If its not, according to the FCC, they have to allow you to buy your own modem as long as its on the Comcast approved list.
1st June 2016 10:12pm
Caitlin says...
I am stuck with Comcast because the property manager has a contract with them and there's no method for residents to buy service elsewhere. Try to separate a "bundle" and Comcast will hit the customer with per diem fees for the remaining services. In other words: take out the phone service and the price for TV and Internet sky rockets well beyond the bundle price for the three. It's a racket.

All I'm trying to do right now is figure out how to get the monthly costs for the rental equipment down by making purchases. I'm told it is possible to buy a modem for the phone and Internet. But not possible to buy boxes for the TV sets. True? Not true?

HELP!

4th May 2016 6:38pm
Dan says...
It is true that you can't buy a set-top box for Comcast yet. The FCC has voted to allow consumers to buy them in the future, but all the regulations and specifications haven't been worked out. Could be a year or years before that's all done.

There are modems you can buy for phone and internet. You should check with Comcast and make sure your region allows consumers to buy their own. You can read more here: Comcast Voice or Triple Play Modems

4th May 2016 7:53pm
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Barbara DuBois (Boulder) says...
I am getting the Comcast triple play and since you don't recommend getting the TG 862 G modem the only one left on your list is the Tm722 g...which is no longer available new, yet highly recommended..and just n/a new. so what does someone do now?. I don't want combo router/modem.thx
25th May 2016 1:39pm
Dan says...
I'm sure it was just a typo on your part, but we do recommend the TG862G, its the TM822G that we don't. You're right, as of right now, your only option for a new modem is to buy the TG862G and if you don't want the WIFI part of it, turn it off and put the modem in bridge mode.
25th May 2016 2:13pm
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JB (The Woodlands) says...
I have Comcast Triple Play. I have the ARRIS TG862G Docsis 3 that is recommended but I have very poor wi-fi. I would like to get a separate router but don't know which one to get. Also, how do I make my ARRIS TG862G modem "bridge" and connect the new router when I get it? Thanks for your help!
13th August 2016 7:30pm
Dan says...
As for putting the ARRIS TG862G in bridge mode, look here: Comcast instructions for bridge mode

I would plug your computer via ethernet into Port 1 of your modem before doing this, so when the wifi is turned off you still have a connection. If you don't see an option for bridge mode, you'll have to call Comcast and have them do it. You then plug your WIFI router into Port 1 of the modem.

A good, popular and moderately priced WIFI router is this one at Amazon: TP-LINK Archer C7 AC1750 Wireless Dual Band Gigabit Router

15th August 2016 3:21pm
Rich (Seattle) says...
Hi Dan,
I have the Arris TG862G. Comcast could not make the modem work here in Seattle. These were used units of ebay. I tried a second unit with no better results. Any suggestions?
Thanks
7th October 2016 11:08am
Dan says...
Often when you buy a used modem, especially on eBay or from a private party, the modem is actually property of the cable company and the seller is a former customer who basically stole it. Comcast knows the serial numbers of these and won't authorize them.

If it wasn't stolen, the modem could still be registered to the former owner and Comcast won't let you use it until the former owner calls Comcast and un-registers it. This actually happened to me a few years ago when I bought a supposedly "new" modem on eBay.

I suppose they both could of been defective and it was just bad luck. All I can suggest is to either buy a new one or buy one from a reputable used modem dealer.

7th October 2016 2:09pm
M Forbes (Norton) says...
I use a TIVO box and Comcast gave me the CableCard tuner to use at no cost. I do not have a Comcast/Xfinity set top box for my television.
23rd July 2016 5:56pm
Dan says...
Good point! Comcast and TIVO have partnered up to make some of the TIVO models work well with Comcast. Just remember to get a TIVO model that supports Comcast's On Demand service, if you use that. Some of the older models do not. Here's some links to TIVO's at Amazon that do support Comcast's On Demand: TIVO Bolt and TIVO Roamio
26th July 2016 3:01pm
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Ronni (Pompano Beach) says...
I am looking to replace the Xfinity modem that has an HDMI port - not an ethernet port and I am not finding one. Motorola said they don't make one. Can anyone help me to find a modem with HDMI so I can stop paying Comcast the rent for their modem? I do appreciate your assistance.
2nd May 2016 8:31pm
1 2 3 > [last]
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Approved Modems Lists

Click below to see a list of compatible and approved modems. These take you directly to their websites.

Comcast

Cox

Charter

Cable ONE

Suddenlink

Time Warner/Road Runner/Bright House


Other Helpful Links

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Wireless Router Buying Guide

Cable Modem Buying Tips and FAQ's