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)
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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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 |
---|---|
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 | #25,646 in Computers & Accessories (See Top 100 in Computers & Accessories) #119 in Computer Networking Modems |
Warranty & Support
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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
7,302
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4.3 out of 5 stars
14,485
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4.3 out of 5 stars
7,302
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4.3 out of 5 stars
7,302
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4.4 out of 5 stars
6,502
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4.5 out of 5 stars
8,392
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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 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
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
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
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
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
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
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
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
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
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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!
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.