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NETGEAR Cable Modem CM400 - Compatible with all Cable Providers including Xfinity by Comcast, Spectrum, Cox | For Cable Plans Up to 100 Mbps | DOCSIS 3.0, Black, 8x4 Cable Modem (CM400)

4.3 4.3 out of 5 stars 7,302 ratings

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About this item

  • COMPATIBLE WITH ALL MAJOR CABLE INTERNET PROVIDERS: Including certification by Xfinity by Comcast, COX, and Spectrum. NOT compatible with Verizon, AT&T, CenturyLink, DSL providers, DirecTV, DISH and any bundled voice service.
  • SAVE MONTHLY RENTAL FEES: Model CM400 replaces your cable modem saving you up to $168/yr in equipment rental fees.
  • BUILT FOR SPEED: Best for cable provider plans up to 100 Mbps speed.
  • WORKS WITH ANY WiFi ROUTER: Connect any WiFi router to this modem's ethernet port to support all your wireless devices.
  • ETHERNET CONNECTIONS: 1 Gigabit Ethernet port connects to your computer or separate WiFi router.
  • MODEM TECHNOLOGY: Engineered with 8x4 channel bonding and DOCSIS 3.0.
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Sold as is. Not responsible for getting it working with your ISP. Make sure they support this modem.

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Product Description

Product Description

The NETGEAR CM400 High Speed Cable Modem provides a connection to high-speed cable Internet, up to 340 Mbps. It is Cable Labs certified and with DOCSIS 3.0 is 8X faster than 2.0. It is compatible with U.S. cable Internet providers like Cablevision, Cox, Time Warner Cable, XFINITY & more.

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Technical Details

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Additional Information

Warranty & Support

Amazon.com Return Policy:You may return any new computer purchased from Amazon.com that is "dead on arrival," arrives in damaged condition, or is still in unopened boxes, for a full refund within 30 days of purchase. Amazon.com reserves the right to test "dead on arrival" returns and impose a customer fee equal to 15 percent of the product sales price if the customer misrepresents the condition of the product. Any returned computer that is damaged through customer misuse, is missing parts, or is in unsellable condition due to customer tampering will result in the customer being charged a higher restocking fee based on the condition of the product. Amazon.com will not accept returns of any desktop or notebook computer more than 30 days after you receive the shipment. New, used, and refurbished products purchased from Marketplace vendors are subject to the returns policy of the individual vendor.
For warranty information about this product, please click here [PDF ]

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NETGEAR Cable Modem CM400 - Compatible with all Cable Providers including Xfinity by Comcast, Spectrum, Cox | For Cable Plans Up to 100 Mbps | DOCSIS 3.0, Black, 8x4 Cable Modem (CM400)


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From the manufacturer

cm400 high speed cable modem
Why Buy Your Own Modem?

Why Buy Your Own Modem?

Save up to 168 Dollars/year

Eliminates monthly rental fees that can amount to 168 dollars a year or more.

No WiFi limits

You’re free to choose & connect the best router for your home’s WiFi needs.

compatability

Compatibility

Swap modems. Not problems. CM400 is compatible with all major cable providers including Xfinity by Comcast, Spectrum, and COX.*

*Not compatible with Verizon, AT&T, CenturyLink, DSL providers, DirectTV, DISH and any bundled voice services

built for speed

Works with Any Wi-Fi Router

Easy 5 Minute Setup

Built for Speed

Supports cable internet plans with speeds up to 100Mbps ensuring fast, reliable internet speed for your home.

Works with Any Wi-Fi Router

Plug the modem into the router that best meets your wireless needs and start streaming.

Easy 5 Minute Setup

Step 1: Plug your coax cable into the modem.

Step 2: Activate by either

(a) connect an Ethernet cable to your computer and follow the on-screen setup, or

(b) call your cable provider to activate over the phone.

Step 3: Plug an ethernet cable between the modem and your Wi-Fi router.

cm400 cm500 cm500v cm600 cm700 cm1000
CM400 CM500 CM500V CM600 CM700 CM1000
Customer Reviews
4.3 out of 5 stars
7,302
4.3 out of 5 stars
14,485
4.3 out of 5 stars
7,302
4.3 out of 5 stars
7,302
4.4 out of 5 stars
6,502
4.5 out of 5 stars
8,392
Cable Provider Compatibility All Major Cable Providers and Xfinity by Comcast, Spectrum, COX All Major Cable Providers and Xfinity by Comcast, Spectrum, COX Xfinity by Comcast All Major Cable Providers and Xfinity by Comcast, Spectrum, COX All Major Cable Providers and Xfinity by Comcast, Spectrum, COX All Major Cable Providers and Xfinity by Comcast, Spectrum, COX
Best for Cable Internet Plan Speed Up to 100Mbps Up to 300Mbps Up to 300Mbps Up to 400Mbps Up to 500Mbps Up to 1Gbps
Works With Any Wi-Fi Router
Gigabit Ethernet Ports 1 x 1G 1 x 1G 1 x 1G 1 x 1G 1 x 1G 1 x 1G
Telephone Voice Ports (Xfinity by Comcast Only) 2 Phone Lines
Modem Technology DOCSIS 3.0 and 8x4 Channel Bonding DOCSIS 3.0 and 16x4 Channel Bonding DOCSIS 3.0 and 16x4 Channel Bonding DOCSIS 3.0 and 24x8 Channel Bonding DOCSIS 3.0 and 32x8 Channel Bonding DOCSIS 3.1, 32x8 Channel Bonding, OFDM 2x2

Customer reviews

4.3 out of 5 stars
4.3 out of 5
7,302 global ratings

Customers say

Customers like the speed, quality and value of the modem. They mention that it's a stellar dual-processor performer, it activated within a few minutes and that the WiFi is strong enough to cover their 1233 sq ft home. They are also satisfied with ease of installation, size, and performance. Others however, are not happy with the connectivity, saying that they're not getting any actual internet connectivity. Customers also have mixed opinions on compatibility.

AI-generated from the text of customer reviews

1,664 customers mention1,315 positive349 negative

Customers like the performance of the modem. For example, they say it works great, is more reliable, and is not susceptible to the issues people are reporting on devices. They also say that it's a quality Netgear product and that it packs a punch.

"...It also is based off a broadcom chipset and is not susceptible to the issues people are reporting on devices that have been based off the faulty..." Read more

"...Given the specifications and the high-quality components it does its particularly job incredibly well...." Read more

"The second modem I received from Amazon has been installed and is working very well...." Read more

"...It's not a bad product, and still saves you money, and performs well, but the glitch can force you to need a new one to get faster speeds, even..." Read more

747 customers mention691 positive56 negative

Customers find the installation process of the modem to be easy. They mention that the setup process was simple and easy to understand. Customers also appreciate the ease of activating the mode via online.

"...Setting up the Netgear CM600 cable modem is as easy to setup as plugging it in and turning it on...." Read more

"...Bracing myself for difficulty with Comcast, I was pleased at how easy setup was without ever having to speak to Comcast's clueless CS...." Read more

"...The setup is simple. 1. Remove your current cable modem. 2. Put this one in it's place. 3...." Read more

"...to take at least an hour due to past experiences ,but no Very fast and simple and this is much better than the Aaris modems plus better looking an..." Read more

466 customers mention357 positive109 negative

Customers like the speed of the modem. For example, they mention it's excellent, has good performance, and does not impact any streaming.

"...to handle the needs of the tech enabled home, it is a stellar dual-processor performer at an incredible price.No. I don’t work at Netgear!" Read more

"...and there is no buffering at all...." Read more

"...this to take at least an hour due to past experiences ,but no Very fast and simple and this is much better than the Aaris modems plus better looking..." Read more

"...Upgrading to Blast, 200MBps, and the speeds stuck at 30MBps...." Read more

439 customers mention381 positive58 negative

Customers like the value of the modem. They mention that it works perfectly and has no recurring costs.

"...than this modem is adequate and fits into a nice price point...." Read more

"...tech enabled home, it is a stellar dual-processor performer at an incredible price.No. I don’t work at Netgear!" Read more

"...It's not a bad product, and still saves you money, and performs well, but the glitch can force you to need a new one to get faster speeds, even..." Read more

"...So, I purchased this puppy. Yeah, it has a cheap price tag, but this little baby packs a punch. I pay for the Extreme package via Time Warner...." Read more

343 customers mention258 positive85 negative

Customers like the quality of the modem. For example,they say the signal seems very strong, and they get faster speeds than their provider. The modem is great, and the WiFi is strong enough to cover their 1233 sq ft home. It has improved streaming through the whole apartment, and it works great for browsing, apps, games, and YouTube. They haven't experienced any drops in internet connection, and can stream HD video without any trouble to any of their devices.

"...It will continue to provide Internet service when other lesser modems will drop out...." Read more

"...I am writing this on day 1 and it has improved streaming through the whole apartment to all Smart devices ,TV's with internet well all internet..." Read more

"Good modem. Using Speedtest.net, its faster and has much lower latency than the Puma chipped Motorola 6121 I had been using...." Read more

"Modems are notoriously “fickle” and require periodic reboots...." Read more

106 customers mention88 positive18 negative

Customers like the size of the modem. They say it's small but powerful, fits easily on their shelf, and is light enough that their cat enjoys knocking it.

"...Just like described. Haven't had any problems, and also, it's really small. Takes up almost no space...." Read more

"...features is also one of its simplest; that of course being its small footprint...." Read more

"...compared the monster boxes Xfinity is using today, but it is significantly smaller and easier to place out of the way, especially since it does not..." Read more

"This Modem is amazing. The small size is perfect for saving space wherever you place it. It is about 1/3rd of the size of my factory ISP modem...." Read more

118 customers mention67 positive51 negative

Customers have mixed opinions about the compatibility of the modem. Some mention that it works with Comcast/Xfinity with no issues whatsoever, while others say that it was not compatible with their provider, the mode can't even detect when the coax was connected, and the laptop could not detect it.

"...Extremely easy to install and works great with xfinity/Comcast!..." Read more

"...that it refuses to recognize my modem serial number as valid for some reason...." Read more

"Works great with Xfinity/Comcast and is saving me > $13 per month; it will recoup the cost in less than a year...." Read more

"...I had a lot of issues with the self-activation as my laptop could not detect it even if it was directly wired in via ethernet...." Read more

345 customers mention85 positive260 negative

Customers are dissatisfied with the connectivity of the modem. They mention that it does not provide WiFi, the signal is horrible, and the mode stopped communicating with the ISP. Some customers also report issues with the latency and intermittent connectivity.

"...Remember, it has no built-in wireless or wired router. Such a router must be purchased separately...." Read more

"...tech support from xfinity, it was found that the modem stopped communicating with the ISP, and the boot file was locked, and even a factory reset..." Read more

"...It also had no internal router, so I didn't have to worry about whether to turn Bridge Mode on, and it had voice over IP functionality since I have..." Read more

"...directly to the modem, at which point he played a game and the ping spikes persisted...." Read more

No more cable modem rental fees for me!!
5 Stars
No more cable modem rental fees for me!!
It was time to start trimming my Time Warner Cable bill. So, I purchased this puppy. Yeah, it has a cheap price tag, but this little baby packs a punch. I pay for the Extreme package via Time Warner. I was averaging 80 megs down. After installing this and getting it activated, my download speeds are averaging over 115 megs down - that's both wirelessly and hard-wired. The setup is simple. 1. Remove your current cable modem. 2. Put this one in it's place. 3. Hard-wire it to a laptop or a desktop (yellow cable to the yellow port on back of cable modem, the other end to the internet port on your laptop or desktop. 4. Power on the modem (making sure you have already connected the coaxial cable as well. (When the globe stays a solid green with no blinking, it is recognized as being connected. 5. Turn to the activation page in the mini manual that comes with it. It will show various internet providers and their perspective links. 6. Open up a browser (with pop-up blocker offf) and follow the prompts. Odds are in favor you will get "due to your account settings, this will not work - call the 1-800 number shown." That's okay, call it. Tell the operator you are installing your own cable modem. The operator will ask for the MAC address (found both on the box and bottom of cable modem). Agent on the phone will first remove your current cable modem from your plan (or else, this will never work). You will power it off upon request, and back on again 30 seconds later. Go to a website of choice - and wa-la, you are back online!! No more cable modem rental fees!! BTW, I work in the IT field, and have for 25 years. This will be all the modem you ever need unless you plan to go over 450 megs in the future. I have the following items that may be online at any time and all at once: Xbox One, PS3, Two laptops, One desktop, one cell phone, and one tablet. I can play Netflix on all devices (4 at once since that's my Netflix account package), and there is no buffering at all. I bundled this with the Netgear WNDR4500 Dual Ban Gigabit Wifi Router. Here's my layout. Cable Modem feeds the router. The router feeds my 16-port switch. I work on computers on the side, so the switch comes in handy. Any questions? Feel free to ask me. Trim your cable bill and get this or any cable modem for that matter. Note, this is a cable modem only that does not supply wifi. It only has the internet-out port. There are no other ethernet ports on it. So, upgrade your router or get one. The model I mentioned above is a great match. You are welcome!!
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Top reviews from the United States

Reviewed in the United States on July 15, 2018
Style: 960 Mbps Max DownloadPattern Name: SingleVerified Purchase
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Reviewed in the United States on November 15, 2017
Style: 300Mbps Max Download w/VoicePattern Name: SingleVerified Purchase
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Ccpd
1.0 out of 5 stars Buena calidad, pero no me funciono.
Reviewed in Mexico on June 2, 2020
Style: 100Mbps Max DownloadPattern Name: SingleVerified Purchase
One person found this helpful
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