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/
Insight


(Not a Comcast/Xfinity customer? Then click your service provider tab above or on the left to find modems.)

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

Modem list updated October 2014. 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 70 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 $8 a month to rent a modem from Comcast, that's $96 a year or $480 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.

Note: These modems will not work if you have Comcast/Xfinity Voice or Triple Play. Read this for more information: Comcast Voice Modems


DOCSIS 3.0 Cable Modems

(Scroll down or click here for DOCSIS 2.0 modems)
Cable Modem Buying Tips and FAQ's
Cheap alternative to Comcast phone service
Need a faster router to go with your new faster modem? Check out our: Wireless Router Buying Guide

Comcast recommends you buy a DOCSIS 3.0 modems for all 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 download bonding to maximize your speed. Those are ARRIS/Motorola SBG6580, SBG6782, SB6141 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!

ARRIS / Motorola SB6141 SURFBoard DOCSIS 3.0 Cable Modem

Click to enlarge: Front View / Back View
Motorola SB6141
ARRIS / Motorola SB6141 Specs

Compare (up to 4 modems)

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.

  • Our rating:
  • Avg. rating at all sellers:

  • 4.6/5 (5,050 ratings counted at all sellers)
See it now at:NewUsed
Amazon $86.98$63.08
Walmarticon $88.24icon
Best Buy $88.99

ARRIS / Motorola SB6121 SURFBoard DOCSIS 3.0 Cable Modem

Click to enlarge: Front View / Back View
Motorola SB6121
ARRIS / Motorola SB6121 Specs

Compare (up to 4 modems)

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.

  • Our rating:
  • Avg. rating at all sellers:

  • 4.5/5 (6,691 ratings counted at all sellers)
See it now at:NewUsed
Amazon $69.97$47.00
Walmart $69.97
Best Buy $69.99

ARRIS / Motorola SBG6580 SURFboard DOCSIS 3.0 Gateway Wireless Cable Modem

Click to enlarge: Front View / Back View
Motorola SBG6580
ARRIS / Motorola SBG6580 Specs

Compare (up to 4 modems)

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.

  • Our rating:
  • Avg. rating at all sellers:

  • 3.8/5 (4,221 ratings counted at all sellers)
See it now at:NewUsed
Amazon $114.47$61.99
Walmart $114.47
Best Buy $119.99

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

Click to enlarge: Front View / Back View
Motorola SBG6782
ARRIS / Motorola SBG6782 Specs

Compare (up to 4 modems)

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.

  • Our rating:
  • Avg. rating at all sellers:

  • 4.2/5 (508 ratings counted at all sellers)
See it now at:NewUsed
Amazon $199.99 $185.99
Best Buy $219.99

Netgear N300 WiFi DOCSIS 3.0 Cable Modem Router (C3000)

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Netgear C3000
Netgear N300 Specs

Compare (up to 4 modems)

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.

  • Our rating:
  • Avg. rating at all sellers:

  • 4.1/5 (269 ratings counted at all sellers)
See it now at:NewUsed
Amazon $97.94 $85.00
Best Buy $99.99
Walmarticon $99.99icon

Netgear N600 WiFi DOCSIS 3.0 Cable Modem Router (C3700)

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Netgear C3700
Netgear N600 Specs

Compare (up to 4 modems)

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.

  • Our rating:
  • Avg. rating at all sellers:

  • 4.1/5 (592 ratings counted at all sellers)
See it now at:NewUsed
Amazon $124.00 $100.00
Best Buy $129.99
Walmarticon $129.99icon

Zoom 5341J DOCSIS 3.0 Cable Modem

Click to enlarge: Front View / Back View
Zoom 5341J
Zoom 5341J Specs

Compare (up to 4 modems)

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.

  • Our rating:
  • Avg. rating at all sellers:

  • 4.5/5 (976 ratings counted at all sellers)
See it now at:NewUsed
Amazon $68.95 $50.00
Walmart $69.97
Best Buy $69.99

Zoom 5352 DOCSIS 3.0 Gateway Wireless Cable Modem

Click to enlarge: Front View / Back View
Zoom 5352
Zoom 5352 Specs

Compare (up to 4 modems)

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.

  • Our rating:
  • Avg. rating at all sellers:

  • 4.1/5 (547 ratings counted at all sellers)
See it now at:NewUsed
Amazon $119.99 $87.99
Best Buy $114.99
Walmart $114.70

Netgear CMD31T DOCSIS 3.0 Cable Modem

Click to enlarge: Front View / Back View
Netgear CMD31T
Netgear CMD31T Specs

Compare (up to 4 modems)

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.

  • Our rating:
  • Avg. rating at all sellers:

  • 4.0/5 (733 ratings counted at all sellers)
See it now at:NewUsed
Amazon $68.16 $45.00
Best Buy $69.99

Motorola SB6120 SURFBoard eXtreme DOCSIS 3.0 Cable Modem

Click to enlarge: Front View / Back View
Motorola SB6120
Motorola SB6120 Specs

Compare (up to 4 modems)

The SB6120 includes an Gigabit ethernet port and is the older version of the SB6121, same specs but a slightly larger case. Supports IPv6 and IPv4 addressing. Works with Windows, Mac, or Linux computers.

  • Our rating:
  • Avg. rating at all sellers:

  • 4.4/5 (2,219 ratings counted at all sellers)
See it now at:NewUsed
Amazon $138.89 $39.11

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.

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!

Motorola Surfboard SB5101U DOCSIS 2.0 Cable Modem

Motorola SB5101U
Motorola SB5101U Specs

Compare (up to 4 modems)

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

  • Our rating:
  • Avg. rating at all sellers:

  • (1,013 ratings counted at all sellers)
See it now at:NewUsed
Amazon $38.99 $9.38

Motorola Surfboard SBG901 DOCSIS 2.0 Wireless Cable Modem

Motorola SBG901
Motorola SBG901 Specs

Compare (up to 4 modems)

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.

  • Our rating:
  • Avg. rating at all sellers:

  • (301 ratings counted at all sellers)
See it now at:NewUsed
Amazon $89.99 $28.36

Comcast Voice or Triple Play Customers:

You will need a cable modem called an EMTA modem. For now, you can only buy them at Best Buy stores in selected cities. There will be a Comcast/Xfinity kiosk in the Best Buy store. If they're not available in your city, you'll have to keep renting your modem from Comcast.

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 3 years now and absolutely love it.
Callcentric - Features
Callcentric - How It Works
How we set-up Callcentric plus more information

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