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Netgear CM600 Review: An Excellent Sub-Gigabit Cable Modem

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The Netgear CM600 Cable Modem is not new. I first got it more than two years ago, together with a 300Mbps Internet plan with Comcast.

Before that, I generally replaced my modem almost every year. So CM600 has been one of my most lasting modems. Two years qualify as long-term. Now I can undoubtedly say this is a reliable device.

That said, if you have a sub-Gigabit cable Internet, which is still the case for most subscribers, currently at some $90, the CM600 is the modem to buy. You likely won't go wrong with it.

Dong's note: I tested the Netgear CM600 with Comcast. While the modem works with almost all cable Internet providers, the experience expressed here is that of an Xfinity user.

Netgear CM600 Cable Modem
The Netgear CM600 cable modem working with the Netgear RAX120 router.

Netgear CM600: A simple modem that works

The CM600 is a typical cable modem. It comes with a coaxial port and a Gigabit network port on the back.

On the inside, this is a 24x8 DOCSIS 3.0 modem with a ceiling WAN speed of up to 960Mbps. Note that 960Mbps is about as fast as a Gigabit connection (after overheads).

So effectively, this modem can deliver a Gigabit broadband connection. However, generally, if you think of Gigabit Internet, a DOCSIS 3.1, like the Motorola MB8600, is a better idea. That's just how the DOCSIS standard works in general.

Netgear CM600 Modem Web Interface
The Netgear CM600 comes with a web interface that shows lots of geeky information for advanced users.

It's important to note, though, the actual speed of a cable modem depends on the provider. That said, your ISP may cap this modem at a lower speed than 960Mbps.

Unlike a router, generally, you don't need to configure a modem other than getting it activated with the provider. However, like the case of the Motorola MB8600, the Netgear CM600 also comes with a web interface accessible via its default IP address, which is

This interface allows you to view the modem status, logs of the WAN connection, and other information. There's also a function for you to restart the modem remotely.

Netgear CM600: Hardware specifications

NameNetgear CM600 Cable Modem
StandardDOCSIS 3.0 24x8
Top WAN speed960Mbps
Ports1x 1Gbps LAN, 1x Coax
Top Internet plan supported960Mbps
WAN Link AggregationNo
ISP supportedComcast Xfinity, Time Warner Cable, Charter, Cox, Cablevision, and others. 
Dimensions8.47 x 9.97 x 3.78 inches
Weight.75 lb
Netgear CM600s cable modem's hardware specifications
Netgear CM600 Lights
Here's the Netgear CM600 in action. Note its status lights.

Standard setup process

Like any cable modem, setting the CM600 is straightforward. First, connect it to the service cable—your TV cable wire, that is. Now, connect its LAN port to your router or a computer, and you're done with the hardware.

The next step is activating it with the service provider. Depending on the service, you might need to call the provider's tech support, or you can do it yourself using your account's information, as I detailed in this post.

In the past two years, I installed multiple CM600 units for friends and family members, and each time the process went quite smoothly.

(Truth be told if you have the subscriber's account information ready—namely the username and password or the account number—the self-activation process is faster than going through Comcast's automated voice menu to get to a real person.)

Netgear CM600: Extra detail photos

Netgear CM600 Cable Modem
The Netgear CM600 is a typical cable modem. Here's its right side.

Netgear CM600 Cable Modem 1
Here's its left side.

Netgear CM600 Cable Modem
The Netgear CM600 is relatively compact.

Netgear CM600 Cable Modem
The modem has a large base to keep it relatively steady.

Netgear CM600 Cable Modem
On the back, you'll find the coax port and a Gigabit LAN port.

Netgear CM600 Cable Modem
The Netgear CM600 comes with a typically-sized power adapter.

Netgear CM600 Cable Modem
On the underside, you'll find the modem's MAC address as well as other default information.

Netgear CM600: Fast and reliable performance

As mentioned above, I've had the Netgear CM600 for more than two years now and never run into any issue with it. So the modem so far has proved to be reliable.

Most importantly, it's been fast, too. I've always been able to get slightly faster Internet speed than what I pay for with it.

Below is the screenshot of my current actual Internet speed. I generally get about 700Mbps of download speed. It's been that way since I upgraded mine to a 600Mbps plan.

Dongs Internet Speed

And that's also the case with my friends who use the same modem. Generally, you can expect an increase of somewhere between 10 to 20 percent in the San Francisco Bay Area.

Obviously, this is not a sure thing and will vary depending on the region and provider. Also, that might be the case if you use another modem. But the point here is that this modem delivers in terms of speed.

Netgear CM600's Rating

8.7 out of 10
Netgear CM600 Cable Modem 4
9 out of 10
Features and Setup
8 out of 10
9 out of 10


Fast and reliable performance for sub-Gigabit broadband

Supported by multiple cable providers

Affordable and relatively compact

Clear status lights, useful web interface


No Gig+ or Multi-Gig support

No WAN Link Aggregation


While the Netgear CM600 is not new and doesn't support cutting-edge technology like DOCSIS 3.1, Multi-Gig, or WAN Link Aggregation, it's an excellent modem to get for those with a sub-Gigabit cable broadband connection.

In fact, for less than $90, it's an excellent alternative to using your provider's equipment, which might cause you some $15/month of the rental fee. Most importantly, you can now even pick a router of your choice without worrying about double NAT.

Clearly, make sure that your provider supports it. By the way, Comcast's representative told me that the company has no plan to retire this modem from its supported list. So it's safe to say it will likely be relevant for many years to come.

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6 thoughts on “Netgear CM600 Review: An Excellent Sub-Gigabit Cable Modem”

  1. So I am looking at modem and was going to get a 400mbps plan with xfinity, but start at 800mbps. Will this be able to run the max 800mbps in wireless? Am to clarify, first you had 300mbps that ran well then you got the 600mbps now and it is still at that speed? What clocking device are you using for that ping and download test?
    Thank you

  2. Another false “review.” you’re gonna get more speed ’cause your ISP provisioned more speed, not because the modem is fast. You’re being paid by netgear in free equipage, admit it! Hire somebody competent to review, like Tim Higgins!

    • Reread the review, Mott. Clearly, if the modem is not fast enough, it can’t be made fast by anyone. As for your claim, here’s the record of my order on the modem. Feel free to check with Amazon using the order number to verify. I don’t bullshit. I’d recommend you do the same. Else, you’re doing your friend a disservice, whoever he is.


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