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NOT A WIRELESS MODEM. READ PRIOR TO PURCHASE PLEASE! Check Compatibility with your service provider prior purchase. Contents: Unit/Power Source/Ethernet Cord. No Stand/Box Terms & Conditions: We solely sell the Device not the service. Seller is not responsible for any Signal or Service Related issues. If you have any issues such as Internet / Phone / Wireless giving outages or not working or poor or inappropriate speeds or low, no or intermittent signals or further any similar related issues including device options not working with or for service provider than these issues can be only related to Service lines or Service Codes used by the service provider. We have no way of assisting you if service provider has any usage restrictions on the device or non-acceptance or denials on them. We are also not responsible for what their system says as that information is limited to them and can be altered at any time by them. Even Federal Consumer Regulations do not honor that information until they provide complete documentation on it. All ISP devices we sell are prior used service devices. All these "used" devices in various used categories may have cosmetic wear & tear or bodily imperfections and must be considered used at all times. We "do" make sure no items have physical damages which may affect the functionality of the device. All devices are considered “technically destroyed” when they are not on an active account and service provider should reinstate them accordingly, although, that still remains at their discretion. Only Seller description and conditions are valid to the item you purchase from the us not Amazon recommendations or Reviews as they may vary. No third party can deem any of our products defective, only us and us solely. Buyer is responsible for all returns and responsible for any wrong purchases or reading errors made when buying. Feel free to contact us prior purchase, not after please as that is the best process for buying online.

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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)

Visit the NETGEAR Store

6,870 ratings

| 804 answered questions

List Price:	$49.99 Details
Price:	$43.99
You Save:	$6.00 (12%)

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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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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.

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 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
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

Compare with similar items

		NETGEAR Cable Modem WiFi Router Combo C6220 - Compatible With All Cable Providers Including Xfinity by Comcast, Spectrum, Cox \| For Cable Plans Up to 200 Mbps \| AC1200 WiFi Speed \| DOCSIS 3.0	ARRIS SURFboard SBG10 DOCSIS 3.0 Cable Modem & AC1600 Dual Band Wi-Fi Router, Approved for Cox, Spectrum, Xfinity & others (black)	Motorola MG7700 24x8 Cable Modem Plus AC1900 Dual Band WiFi Gigabit Router with Power Boost, 1000 Mbps Maximum Docsis 3.0 - Approved by Comcast Xfinity, Cox and More	NETGEAR CM500 Cable Modem	NETGEAR Nighthawk Cable Modem WiFi Router Combo C7000-Compatibility Cable Providers including Xfinity by Comcast, Spectrum, Cox (Renewed)

Customer Rating	(6870)	(18024)	(10652)	(4951)	(13373)	(2810)
Price	$43.99	$56.76	$119.00	$169.99	$37.00	$119.00
Sold By	Abe's Electronics Center	Amazon.com	Amazon.com	MTRLC LLC	Supply Perfect	DealParade
Are batteries included?	No	No	No	No	No	No
Are batteries required?	No	No	No	No	No	No
Color	Black	black	Black	—	Black	—
Connectivity Technology	WLAN, LAN	Wi-Fi, USB, Ethernet	Ethernet, Wireless	Wi-Fi, Ethernet	—	Wi-Fi, USB, Ethernet
Data Transfer Rate	100 Mb per second	1200 Mb per second	686 Mb per second	1 Gb per second	680.0 Mb per second	1.9 Gb per second
Item Dimensions	5.8 x 3.8 x 1.8 inches	9.23 x 6.1 x 2.25 inches	6.77 x 1.97 x 6.58 inches	8.6 x 2.6 x 9 inches	8.78 x 7.2 x 3.82 inches	11.65 x 11.02 x 3.94 inches
Item Weight	1.00 lbs	0.95 lbs	1.96 lbs	1.50 lbs	0.62 lbs	1.60 lbs
Modem Description	Cable	Cable	—	—	cable	—
Range	Small to medium homes	—	—	—	1.0	—

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Product description

Style:100Mbps Max Download | Pattern Name:Single

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.

Amazon.com

Product information

Style:100Mbps Max Download | Pattern Name:Single

Technical Details

Collapse all

Summary

Wireless Type

‎Radio Frequency

Other Technical Details

Brand

‎NETGEAR

Series

‎CM400

Item model number

‎CM400-1AZNAS

Item Weight

‎1 pounds

Product Dimensions

‎5.8 x 3.8 x 1.8 inches

Item Dimensions LxWxH

‎5.8 x 3.8 x 1.8 inches

Color

‎Black

Voltage

‎100240 Volts

Manufacturer

‎Netgear Inc

ASIN

‎B0111MRLES

Is Discontinued By Manufacturer

‎No

Date First Available

‎July 1, 2015

Additional Information

Customer Reviews

6,870 ratings

4.3 out of 5 stars

Best Sellers Rank

#1,417 in Computers & Accessories (See Top 100 in Computers & Accessories)
#22 in Modem Router Combos

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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Product guides and documents

Installation Manual (PDF)

Safety Information (PDF)

Product Documentation (PDF)

Important information

Legal Disclaimer

Sold as is. Not responsible for getting it working with your ISP. Make sure they support this modem.

Customer Questions & Answers

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Customer reviews

5 star		70%
4 star		13%
3 star		6%
2 star		3%
1 star		8%

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Top reviews from the United States

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CM10014

Bam! Saved $11/month in 2 days and 5 minutes! (UPDATED 4/5)

Reviewed in the United States on March 21, 2018

Style: 300Mbps Max Download w/VoicePattern Name: SingleVerified Purchase

Five minutes after arriving on our doorstep, the new cable modem is up and running. Bracing myself for difficulty with Comcast, I was pleased at how easy setup was without ever having to speak to Comcast's clueless CS. Using a laptop with an Ethernet jack, here's how easy it was:
1) Wrote down my Comcast account number (This is the MOST important step!!!)
2) Connected modem to cable, power, and phone line
3) Connected Ethernet cable to modem and computer
4) Waited three minutes for the first three lights to blink steady (they'll blink and flash while the modem is syncing. You could wait up to 10 minutes for sync).
5) Turned off WiFi
6) Opened web browser, and Firefox had a nice little 'show login page' button appeared (if this doesn't show, you can go to xfinity.com/activate)
7) Entered my account number and street address
8) The modem reset itself. I plugged that into my Luma and we were off to the races!

Ironically, Comcast sent a new tower modem a week ago. I don't know if it's me, but this seems faster than that did - speed about the same but ping time is now 9ms instead of 14 and pages that seemed to load slowly before pop in immediately. Biggest bonus is that we're saving $11/month going forward.

UPDATE: 4/5/18 - Everything was working perfectly until Comcast turned off my service this weekend because the modem wasn't registered in the right database and Comcast thought I had no equipment. Object lesson: After activating online, call Comcast to make sure the equipment has registered across all of their databases - 5 minutes could save you 2 hours! The modem, however, is working flawlessly and I still highly recommend it!

1,412 people found this helpful

Helpful

MacDelta

Using the CM600: What it is; what it isn’t, and why that’s a good thing

Reviewed in the United States on July 15, 2018

Style: 960 Mbps Max DownloadPattern Name: SingleVerified Purchase

The Netgear CM600 cable modem is an ultimately reliable DOCSIS 3.0 cable modem for service speeds up to 300 Mb/sec or faster. Unlike the company’s CM700 model, it does not incorporate the troublesome Intel Puma 6 chipset found in many higher-end cable midems, making it a more reliable choice.

There may be a downside for some, having little to do with the CM600. When accessing the CM600 interface, it is noted that ALL firmware upgrades can only be provided by the ISP (in my case, Spectrum). Whether Spectrum will upgrade said firmware (when and if necessary) is questionable, though it would be to their advantage.

It has also been explained that Spectrum cannot remotely troubleshoot issues in “non-standard,” cable modem/routers. These being anything other than the standard free cable modem/routers Spectrum installs as part of their service. They can, however, initiate a reboot and validate that the CM600 is functioning.

Funny, this seems more like a positive for me! As a trained network support technician, I like the idea that Spectrum cannot manipulate the settings of either my modem or router; something I am more than capable of doing on my own.
Setting up the Netgear CM600 cable modem is as easy to setup as plugging it in and turning it on. The CM600 was fully functional within seconds of connecting the Internet cable to the back.

The CM600 is a one-trick pony; it is a cable modem and nothing else. It converts cable data into Internet data. Given the specifications and the high-quality components it does its particularly job incredibly well. The CM600 is built to pull a signal out of a weak or “noisy” line. It will continue to provide Internet service when other lesser modems will drop out. Since purchasing this modem, I have had no random cable dropouts from my ISP. Remember, it has no built-in wireless or wired router. Such a router must be purchased separately.

A quick aside: The router is the Grand Central Station of your home’s WiFi universe. It takes a tremendous amount of efficient but fast processing power to send and receive multiple data streams quickly and effectively between a houseful of smartphones, smart HDTVs, computers, tablets, cameras and other WiFi-enabled gizmos and the Internet. A router is a radio transceiver. The more powerful it is, the more information it can send through the air over longer distances. The more sensitive it is, the more it can pick up data being transmitted 500+ feet away. To get the best benefit from your Netgear CM600, I recommend the Netgear Nighthawk® R7000P. Built 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!

617 people found this helpful

Helpful

Albert

There's good news and bad news here - mostly good

Reviewed in the United States on June 23, 2018

Style: 300Mbps Max Download w/VoicePattern Name: SingleVerified Purchase

The second modem I received from Amazon has been installed and is working very well. Three years ago, I decided to stop paying Comcast's rental fees and purchased my own modem: an Arris tg862g. That one was also purchased from Amazon and did a nice job for three years (though it appears to be end-of-life now). I decided to purchase a new, faster modem to update my system and came across this one. I didn't want a router because I plan to install a Google Wifi mesh system to help eliminate internet slow spots in my house. I decided to go ahead and get a telephony modem even though I don't use the phone part of Triple Play because I didn't want issues with Comcast.

The good news: The installation of the Netgear took about 2 hours. I followed the "Quick Start" guide which came with the second modem, and probably didn't wait long enough for the modem to totally start up before I plugged my computer into the modem. When I tried to call the two phone numbers provided, I didn't get a prompt that allowed me to talk to someone about activating the modem - the phone system would not take "activate modem" as an option. Comcast's own website says that after plugging in the computer, I should have been automatically sent to an activation page. That didn't happen, and putting "xfinitiy.com/activate" into the browser didn't work to get me to an activation page either. So I reinstalled my old modem and started a chat with Xfinity. The guy asked for all of the information that's noted on the Quick Start Guide (make and model number, serial number, MAC address), and then went away, telling me to stay on the connection while he activated my modem in their system. After 20 minutes of waiting I asked if he was still there a few times - no response. So I stopped the chat, installed the new modem, and plugged my computer in, and got to the activation page immediately. A code was texted to my phone and it seemed to be up and running but sadly only for 10 minutes. Then dead again. This time when I called the Xfinity phone number, one of the options was "connectivity issues", which I picked. The computer re-booted the new modem. and all seems to be well.

It seems that people have had luck using the "plug and play" method, but my modem required a bit more intervention. Comcast's phone system is still a hurdle but don't despair, it just requires persistence. I had several hiccups when I set the Arris up three years ago, too.

So what's the bad part? The modem I installed was the second one I got from Amazon. Here's the story of the first one.

When I opened the brown shipping container from Amazon, I knew there was a problem. (1) The Netgear's box was unsealed, and (2) the flap to open the box was torn. (3) the modem was scuffed and dirty, and (4) the power cord was partially wrapped around the power "block" and the rest was stuffed in haphazardly. I didn't realize until I got the second one that a couple of other items were missing from the first one: (5) there was no Quick Start documentation in the box, and (6) the phone cord was missing. I decided that I had gotten a used item that had been installed and could have been defective, which is why it got returned. I really didn't want to try to install a potentially defective modem - installing a perfectly good one is a lot of work and aggravation and the chance that the first one was bad was too much of a risk for me. I don't have any problem ordering a returned/certified item but this one clearly hadn't been looked at to make sure it was in working order. I returned the first one as "damaged" and requested a replacement. The second one came quickly and was sealed and brand new. My review of the first modem was rejected by Amazon (not within their guidelines) but I thought I'd put the particulars here in case Amazon tries to charge me a restocking fee because there are items missing in the box I returned. And also in case this happens to someone else too.

59 people found this helpful

Helpful

Top reviews from other countries

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Ccpd

Buena calidad, pero no me funciono.

Reviewed in Mexico on June 2, 2020

Style: 100Mbps Max DownloadPattern Name: SingleVerified Purchase

Excelente servicio, voy a probar el modem y les aviso. No me funciono, mi proveedor de internet no lo dio de alta.

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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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