Wireless Type | Radio Frequency |
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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)
Purchase options and add-ons
Brand | NETGEAR |
Model Name | CM400 |
Special Feature | WPS |
Frequency Band Class | Dual-Band |
Wireless Communication Standard | Radio Frequency |
Compatible Devices | Personal Computer |
Frequency | 5 GHz |
Recommended Uses For Product | Home |
Connectivity Technology | LAN, WLAN |
Color | Black |
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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Important information
Legal Disclaimer
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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Product information
Technical Details
Brand | NETGEAR |
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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 |
ASIN | B0111MRLES |
Is Discontinued By Manufacturer | No |
Date First Available | July 1, 2015 |
Additional Information
Customer Reviews |
4.3 out of 5 stars |
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Best Sellers Rank | #26,347 in Computers & Accessories (See Top 100 in Computers & Accessories) #126 in Computer Networking Modems |
Warranty & Support
Feedback
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From the manufacturer
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
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Built for SpeedSupports cable internet plans with speeds up to 100Mbps ensuring fast, reliable internet speed for your home. |
Works with Any Wi-Fi RouterPlug the modem into the router that best meets your wireless needs and start streaming. |
Easy 5 Minute SetupStep 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 | |
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Customer Reviews |
4.3 out of 5 stars
7,303
|
4.3 out of 5 stars
14,488
|
4.3 out of 5 stars
7,303
|
4.3 out of 5 stars
7,303
|
4.4 out of 5 stars
6,506
|
4.5 out of 5 stars
8,398
|
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
Customer Reviews, including Product Star Ratings help customers to learn more about the product and decide whether it is the right product for them.
To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzed reviews to verify trustworthiness.
Learn more how customers reviews work on AmazonCustomers say
Customers like the performance, ease of setup, value, and signal strength of the modem. For example, they mention that it works brilliantly, the activation process was extremely easy, and the included instructions were very clear. That said, some complain about the connectivity.
AI-generated from the text of customer reviews
Customers like the performance of the modem. For example, they mention that it works brilliantly, and telephony works smoothly. They also say that the internet still works fine, and there have been no latency issues or other hiccups. Overall, most are satisfied with the performance and functionality of the product.
"...The modem has been rock solid since with no issues on the phone or voice side...." Read more
"...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
"...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
"...However the more we gamed the more we noticed that the lag spikes were becoming more frequent/intense, sometimes resulting in a full Disconnection..." Read more
Customers find the setup process of the CM600 cable modem to be easy. They mention that the included instructions are clear and easy to understand. Customers also appreciate the amazing ping times and smooth interactive comms and gaming while watching videos.
"...Setting up the Netgear CM600 cable modem is as easy to setup as plugging it in and turning it on...." 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
"...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
Customers like the value of the modem. They mention it's good for the price, saves them $10 a month, and is an inexpensive combo that kicks butt. Some say that the installation was super easy. Overall, most are satisfied with the value and performance of this product.
"...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
Customers are satisfied with the signal strength of the modem. They mention that it is much more reliable than the Comcast modem that they had been renting previously. The hardware is perfectly fine, and the mode is not susceptible to issues reported on devices. The signal seems very strong, and it appears to be stable.
"...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
"...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
Customers like the size of the modem. They say it is small but powerful. Some customers also mention that it takes up less space.
"...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
Customers are mixed about the quality of the modem. Some mention it's a great piece of equipment for their Internet needs, very easy to install, and an excellent choice. However, others say that the web interface is not well made, the constant drop outs render it useless, and the plastic pieces fall off.
"...cable from my wifi router into this cable modem, the clear plastic plug just kept falling out of its port on the modem!..." Read more
"...A bit rough around the edges. I changed the password and the modem locked up. Took me two restarts before I got it back...." Read more
"...This is on their list of supported modems and is the most basic type you can get...." Read more
"...Of course I did not expect him to call me back. I feel that the waranty is a scam...." Read more
Customers are dissatisfied with the connectivity of the modem. They mention that it doesn't provide WiFi connectivity and has a sudden internet connection issue. Some say that the mode has latency and intermittent connectivity. They also say that it would fail every time the connection went out.
"...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
"...The Netgear's box was unsealed, and (2) the flap to open the box was torn...." Read more
"...directly to the modem, at which point he played a game and the ping spikes persisted...." Read more
"...Since purchasing this modem, I have had no random cable dropouts from my ISP. Remember, it has no built-in wireless or wired router...." Read more
Customers are dissatisfied with the temperature of the modem. They mention that it runs a bit warm and overheats when knocked over.
"...It does get slightly warm at the top , It been plugged in about 45 minutes now so i dont see it being a problem ...." Read more
"...I have also noticed it runs pretty hot. Maybe it is overheating and dropping packets? I dont know, but it is not working...." Read more
"...a struggle to put in place, and the best part is that the modem doesn't get very warm either, so we're very confident the NetGear CM500V's going to..." Read more
"...Not impressive. Runs hot to very hot. I point a little USB fan at it when I'm running high mbps rates (>5) for hours. Cools it right down...." Read more
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The CM500V has 16 downstream channels compared to the 8 channels on the tm822g. I do not notice any difference in top speed with this new modem as the bursts seem to cap at around 240mbps. It does seem though that when the modem is under load it seems to handle it better having more downstream channels to spread the bandwidth over. This modem does future proof a little as it would be adequate if comcast decides to up the speed to 686mbps at some point. Although, if that were to happen I would need to replace the AC66U because the CTF hardware acceleration on packet switching from the wan tops out around 300mbps.
That all aside, I had no problem installing the modem. I plugged it in and it booted up and I was directed to the comcast walled garden. I put in my account information and it rebooted and was working within minutes. I did not have to call comcast. Once the modem was working I plugged it into my router and then I lost wan connectivity. Once I rebooted the router and the modem everything was up and running again. Since I was plugged directly into the modem from my laptop when it first booted up it got an IP address based on the MAC address of my laptop. That was why i lost connectivity when i plugged it into the router. Once I rebooted them both the modem pulled a new ip address and everything was good. The modem has been rock solid since with no issues on the phone or voice side.
If you want a modem that is literally only an internet and voice modem that doesn't do any routing (because you have your own routing hardware) and doesn't have wifi (again because you have a router or an AP for that) than this modem is adequate and fits into a nice price point. 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 intel puma 6 chipset like the arris 6190. There has supposedly been promised a firmware update to fix the 6190 but it has yet to be seen. The arris 6183 is not affected by this issue in fact, the 6183 uses the same broadcom chipset the cm500v does. The key difference is that the cm500v has voice and the 6183 does not. The 6183 is one of the most popular retail modems and this devices is every bit its equal despite its slightly higher pricepoint, which as you may note, is because of the emta functionality the 6183 lacks.
So if you need a reasonably priced 16x4 channel modem that doesn't have all the bells and whistles of the gateways the ISPs try to rent you and you dont have voice service from comcast, you can get an arris 6183 and save a few bucks.
If you however have a triple play with voice, this modem is basically a 6183 with voice. If you check the datasheets its the exact same broadcom chipset.
If you feel the need to check the webUI of this modem you will find its very simple and there isn't a lot you can do from there other than check the status and reboot the modem. The webUI is very lean on functionality. But honestly, I dont consider that an issue because as subscribers to an ISP we dont really handle any of the configuration anyway. The modem downloads the docsis config form the ISP when its provisioned so really that point is moot.
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!