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

Modem list updated August 2015. 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: These modems will not work if you have Comcast/Xfinity Voice or Triple Play. Read this for more information and to see modems that will work: 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 plans: Economy, Performance, Ultra, Blast! and Extreme. For Extreme 150 plans, choose a modem with 8-channel downstream bonding to maximize your speed. Those are ARRIS/Motorola SBG6580, SBG6782, SB6141, SB6183, Netgear C3000, CG3000Dv2, C3700 and Zoom 5352.

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 the most important factor. 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 (though the SB6121 is fast enough for almost all current internet plans.) Supports IPv6 and IPv4 addressing. Works with Windows, Mac, or Linux computers.

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  • 4.6/5 (6,776 ratings counted at all sellers)

33% of July's visitors who bought a DOCSIS 3.0 modem, bought this one.

ARRIS / Motorola SB6121 SURFBoard DOCSIS 3.0 Cable Modem

ARRIS / Motorola is a big name in cable modems and you can't go wrong with any of their Surfboard modems. The ARRIS / Motorola SB6121 has the exact same specs as the SB6120 and is basically the updated, newer version of it, with a slightly smaller case. The new version of this modem is the SB6141, which has twice the maximum download speed of the SB6121. Supports IPv6 and IPv4 addressing. Works with Windows, Mac, or Linux computers.

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  • 4.5/5 (6,691 ratings counted at all sellers)

26% of July'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. Supports IPv6 and IPv4 addressing. Works with Windows, Mac, or Linux computers.

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  • 3.8/5 (4,221 ratings counted at all sellers)

9% of July'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 the latest version in their Surfboard series. With 16-channel downstream bonding and 4-channel upstream, it can handle the fastest internet plans. Unless you subscribe to one of those plans or really want to future-proof well into the future, you probably don't need this modem. Supports IPv6 and IPv4 addressing. Works with Windows, Mac, or Linux computers.

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  • 4.6/5 (342 ratings counted at all sellers)

6% of July's visitors who bought a DOCSIS 3.0 modem, bought this one.

SEE IT NOW AT:NEWUSED
Amazon $129.99$107.24
Best Buy $129.99

ARRIS / Motorola SBG6782 SURFboard eXtreme 802.11ac DOCSIS 3.0 Cable Modem and 4-Port Gigabit Ethernet Router

The ARRIS / Motorola SBG6782 is the latest modem from ARRIS/Motorola. It has a built-in wireless-AC router, for the fastest WIFI speeds. It also has 4 Gigabit Ethernet Ports. We normally don't recommend modem/router combos, but this is an exception. 8-channel downstream, and 4-channel up and is a few inches bigger than other modems. Supports IPv6 and IPv4 addressing. Works with Windows, Mac, or Linux computers.

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  • 4.2/5 (832 ratings counted at all sellers)

3% of July'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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  • 4.1/5 (269 ratings counted at all sellers)

8% of July'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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  • 4.1/5 (392 ratings counted at all sellers)

3% of July'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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  • 4.1/5 (592 ratings counted at all sellers)

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

Zoom 5341J DOCSIS 3.0 Cable Modem

The Zoom 5341J is the updated version of the 5341. It has 8-channel bonding for downloading, doubling the maximum download speed of the 5341. Supports IPv6 and IPv4 addressing. Works with Windows, Mac, or Linux computers.

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  • 4.5/5 (976 ratings counted at all sellers)

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

Zoom 5352 DOCSIS 3.0 Gateway Wireless Cable Modem

The Zoom 5352 is a cable modem with a built-in wireless-N router. It has 4 Gigabit Ethernet ports, and with 8 channel bonding, 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 (547 ratings counted at all sellers)

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

Netgear CMD31T DOCSIS 3.0 Cable Modem

The Netgear CMD31T, made by the company known for their network devices, has 4-channel bonding for both upstream and downstream. Supports IPv6 and IPv4 addressing. Works with Windows, Mac, or Linux computers.

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  • 4.0/5 (733 ratings counted at all sellers)

1% of July's visitors who bought a DOCSIS 3.0 modem, bought this one.

SEE IT NOW AT:NEWUSED
Amazon $89.95 $43.49

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)
SEE IT NOW AT:NEWUSED
Amazon $64.99 $30.22

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 $88.88 $15.00

Comcast Voice or Triple Play Customers:

You will need a cable modem called an EMTA modem. Not all Comcast regions let you buy your own EMTA modem. In some regions, you can buy them only from Best Buy. There will be a Comcast/Xfinity kiosk in the Best Buy store. For other regions, call your local Comcast service center and check if they allow customer owned EMTA modems. If so, the following ones can be bought from Amazon (these links take you to Amazon):

Please call Comcast before purchasing 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, 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

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Louis Pisarro (Mount Laurel) says...
The TM722g is NOT compatible with Comcast, it is end of life.
22nd June 2015 8:06pm
Dan says...
Thanks for the heads up, we took it off the list. Looks like the retail version just went on the end of life list. Apparently Arris isn't supporting it anymore.
22nd June 2015 10:28pm
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H M Motley (Richmond Va) says...
Interesting! I have triple play and am using an ARRIS 722G.

It's main problem is the very bad RF interference it puts out. I'm a ham radio operator and it puts out RF in the 160 meter band 1800-2000 kHZ. Are their newer models any cleaner?
Is there no other brand that will work?

26th June 2015 12:27am
Dan says...
If you already lease an ARRIS TM722G, it'll still work on Comcast. I think they're just recommending that customers not to buy one.

Sorry I don't know if any of the other models put out less RF interference. Anybody else have an idea?

26th June 2015 12:28pm
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Steve (Delaware) says...
Can I add a modem/router to my existing Comcast system that already has one on it. I want the kids and their friends to have their own network so they don't have to use mind that has has a password I'd rather not give out.
11th June 2015 3:34pm
Dan says...
All of the above cable modems with a built in wifi router have an option called a guest account. You can set up a separate network with its own password and don't have to give out your main network password. If you already have a modem, there's plenty of WiFi routers that have that option as well.
11th June 2015 8:17pm
Bob (St Johns) says...
I have comcast/ Xfinity. Triple play which modem do you need for triple play?
28th May 2015 12:47pm
Dan says...
Look right above this comment section for "Comcast Voice or Triple Play Customers" or click this: http://www.buyacablemodem.com/comcast.php#voice
28th May 2015 1:36pm
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Steven Solomon (East Brunswick) says...
The problem is that Comcast charges $10 a month more for just the TV & internet. If you have their triple play it's less money then if you have just the TV & internet
31st October 2014 8:09am
Scott (Bristol In) says...
Not true. I have triple play and my modem is $10/mo
23rd January 2015 6:56pm
Dean (Seattle) says...
I think Steven means that if you have TV/Internet/Phone with comcast, you pay less than if you just have Tv/Internet. The "rent" on the modem is the same either way.
That said, I just canceled TV/Phone w/ Comcast for a $35/mo savings. Will buy my own modem for an extra $10 savings and I get Free TV with an Antenna now. Anything else I can pull in on the internet and watch on my computer ... that I can hook up to the TV. That's over $600 per year savings!
20th February 2015 12:11am
Page 1 of 1  (11 comments)


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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