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Item#: 9SIA0ZX2C26865

NETGEAR CMD31T-100NAS High Speed Cable Modem - DOCSIS 3.0 Ethernet Port

  • Compatible with Time Warner, Comcast, Charter, Cablevision, and others
  • Up to 150 Mbps download and upload speed
  • Docsis 3.0
  • Gigabit Ethernet port
  • Support IPv6
  • CD-less installation
  • Pin It
  • Email this page
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Learn more about the Netgear Inc. CMD31T-100NAS




Cable Modem
Ethernet Port
Cable Interface
One (1) LAN Gigabit Ethernet port
One (1) WAN Female F connector


For high-speed cable Internet access

Works with major cable ISPs

Save money-no monthly equipment charges

Designed to meet DOCSIS 3.0 specifications and backward compatible with DOCSIS 2.0 networks

IPv6 Next Generation Internet addressing support

Gigabit Ethernet port with auto-sensing technology

System Requirements:
Cable Broadband Internet service
Microsoft Windows 7, Vista, XP, 2000, Mac OS, or other operating systems running a TCP/IP network
Microsoft Internet Explorer 5.0, Firefox 2.0, Safari 1.4, or Google Chrome 11.0 browsers or higher

CD-less installation.


Package Contents
High Speed Cable Modem - DOCSIS 3.0 (CMD31T)
Ethernet cable
Power adapter, localized to country of sale

Quick Info


  • Limited Warranty period (parts): 1 year
  • Limited Warranty period (labor): 1 year

Customer Reviews of the Netgear Inc. CMD31T-100NAS

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  • Bruce S.
  • 12/1/2014 12:32:31 PM
  • Tech Level: Average
  • Ownership: more than 1 year

1 out of 5 eggsNo to Netgear MODEM

Pros: It is fast when it is connected to Comcast

Cons: I have to reboot this almost once a week to re-connect to the Internet, very painful when you have young kids trying to get on the Internet or streaming movies. I will be my last Netgear product. Going back to the brand I have used in the past.

Did you find this review helpful? Yes No

  • Damon L.
  • 7/20/2014 5:49:35 PM
  • Tech Level: Somewhat High
  • Ownership: more than 1 year

1 out of 5 eggsProblems with Comcast Business Class

Pros: Worked for a while with residential at 100MB+

Cons: Does not work with business class and since residential is basically unusable for heavy internet users due to ridiculous data caps, if you use Comcast, avoid this modem. I am able to get 30MBs service tops. THe problems is supposedly in the "boot file" comcast attempts to load, but they've been working on it for 2 months and its still broken. Probably comcast's fault, but still, avoid the modem if you use comcast.

1 out of 1 people found this review helpful. Did you? Yes No

  • Charles M.
  • 7/17/2014 7:52:37 AM
  • Tech Level: High
  • Ownership: 1 day to 1 week

1 out of 5 eggsDon't buy this product

Pros: no cd setup

Cons: This product is NOT compatible with Xfinity/Comcast....
Every night when not in use, this modem "disconnects" from my Xfinity internet service... I have to reboot it EVERY morning when I wake up... Comcast blames Netgear, and Netgear blames Comcast... 7/17/2014

Other Thoughts: Just buy a Motorola modem and save yourself the headache....

Manufacturer Response:

Hi Letigre,

Please email us at provide a copy and paste of your review and any case numbers you received from support.



Did you find this review helpful? Yes No

  • Anonymous
  • 6/25/2014 11:59:06 PM
  • Tech Level: Somewhat High
  • Ownership: more than 1 year

1 out of 5 eggsRIP Modem (2013 - 2014)

Pros: This is a follow-up review.

Previous review cited:
Easy set-up
Indicator lights

Cons: Previous review cited:
No appreciable improvement in speed.

So what happened? Well, the modem stopped working. The upstream connection was bad for months and my cable company actually believed it was their fault. They were going to come out, troubleshoot, install new coax, etc. After three months with no alternative but a big serious service visit from the cable co. to potentially rewire my whole building, they walked me through some more troubleshooting and (surprise!) it's the modem. Confirmed 100% it's the modem.

Call up Netgear, go through the whole spiel hear all about the service packages I can buy -- no, thanks, I just want my broken product fixed or replaced.

Sorry, they say, it's out of warranty. When I insist that the problems started before the warranty occurred, they tell me that this is irrelevant. When I stand by my assertion that the problems originated in the warranty period, they relent -- they know how the law views warranties, and that this must be covered. But they can't shut up about how kind they are to give me a "grace period" (even though really, they're just honoring the warranty consistent with existing case law on warranties).

Great! I'm ready to get that RMA as soon as we work through the troubleshooting and find that the modem is broken. Except I can't work through the problem myself. In order to replace the unit, I have to go through Netgear support to determine that it is a brick. And that's not free. In fact, they want to sell me a service plan that costs more than the modem.

After speaking with them for an hour, I am told that there is no defect, that the hardware is perfect (which we can diagnose, apparently, by pinging the modem -- that's the entirety of the test!) and that I need to upgrade the firmware. For a big fat fee, they will tell me how to upgrade the firmware.

When I tell the guy there are no firmware updates for this modem on Netgear's website, he tells me the current firmware revision and before I have a chance to say "that's what I've got and this darn thing is still defective" he hangs up. "I can't give away tech support for free" he says.

I call back and I'm presented with the same options: Sit on the phone with tech support. If they can manage to fix the problem, pay them a huge sum of money (to fix a problem with hardware they should be fixing under warranty!). If they can't fix it, I won't have to pay and I'll get my RMA. But I can't get the RMA without phone support troubleshooting the problem, which means I can't get my RMA without risking a non-RMA fix for the hardware failure, for which I am charged $100+.

Sorry Netgear, I called for tech support. If I wanted to gamble, I'd go to Las Vegas. This is not an appropriate tech-support practice -- as far as I'm concerned, it's a racket. Operating out of India, I'm not sure whether that type of racket is legal.

Other Thoughts: My previous review stated "if it doesn't catch on fire or stop working, it's good." While there was no need to call the fire dept., this unit just plain stopped working. All through its death throes, power cycling the unit would fix the issue. My cable company told me they would replace the wiring to fix the signal problem, they'd do whatever they needed to do to fix it. But in the end, this modem was slowly dying for several months. When it finally kicked the bucket, Netgear had me on the phone for two solid hours trying to get me to pay for phone support just to get my RMA. I have better things to do. I'm not going to give somebody money to tell me a brick is a brick. I know it's a brick. It's supposed to be a modem. That's why I want it fixed or replaced. I shouldn't have to litigate my way to a replacement, gambling on whether or not phone support can fix the problem.

This process is incredibly disappointing. This is a premium product in a market where most people get modems for free from their providers. Netgear needs to own up to the poor workmanship of this product -- which is evident from the reviews that have piled up since I wrote my previous review one year plus two weeks ago. They need to provide people with a path to RMA that does not require them to risk steep customer service charges if it turns out the issue was some non-RMA issue for which Netgear is still responsible. This is a class-action suit waiting to happen.

Netgear has a history, in general and with this unit in particular, of taking a very strict interpretation of what their warranty covers -- hardware only. They won't do ANYTHING for you unless you (1) have a problem with hardware, not firmware, software, or other problems that could be Netgear's fault and (2) you pay them for the phone support to determine that you do have a hardware problem.

This is a complete joke, and based on my two hour merry-go-round with people trying to sell me a service plan and refusing to issue me an RMA unless I bought one, customers are the but of the joke. If you buy a Netgear product, you should interpret ANY warranty statement as "90 day window for tech support, with RMA only if the physical hardware is defective." They had me ping my modem over a direct ethernet connection and RULED OUT ALL HARDWARE DEFECTS based on a ping! I nearly laughed out loud, except I had already been on the phone 70-80 minutes at that point and was not in the mood. Netgear probably turns a big profit on its support, and it sounds to me like they don't mind if a few of their units mysteriously break -- they make cash on both ends, so to speak.

The downgrade two one egg is really better than this product deserves, considering it will still average out to 2.5 eggs considering my previous 4-egg review.

Manufacturer Response:

Hi Anonymous,

We want to assure you that we stand behind our products and are here to help. We want to follow up with you on your support contact and do whatever we can to help. Please email us directly at and we'll look into this immediately.



1 out of 1 people found this review helpful. Did you? Yes No

  • Timothy C.
  • 5/30/2014 10:54:32 AM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

2 out of 5 eggs6 Month Life span

Pros: User interface was easy to work with.

Cons: After about 6 months of ownership the think would stop communicating. The power off wouldn't work. Had to press the little button in the back. Which worked most of the time but would kick out in about a day

Manufacturer Response:

We are very sorry about the CMD31T not working any longer. The standard NETGEAR warranty is as follows:

1 year hardware warranty
90 days phone support
Email support is valid for warranty support period

Please email us at with a copy and paste of your review and any info that help speed things up on our end.



Did you find this review helpful? Yes No

  • Kenneth D.
  • 2/17/2014 2:13:56 PM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year

1 out of 5 eggsNETGEAR CMD31T

Pros: When working it supports reasonable speed. Easy to install.

Cons: Modem slows down and stops working frequently. Have to power down for several minutes to resolve issue. In some cases it takes almost an hour to comeback to life.

Netgear customer support line consistently disconnects phone calls. After waiting for several minutes you get a busy signal. This has happened multiple times on different days for different issues. Very frustrating... Don't waste time with call in phone support. Use their online form submission which is under "my support" tab assuming you registered the products with their website my.netgear,com.

Other Thoughts: I've been struggling with the Netgear CMT31T cable modem which I purchased new 1/31/14. It frequently requires power downs to get it to function. Many users report this symptom.

The cable technician showed me how to access the cable modem page x.x.100.1 on my internal LAN. In my networks case This supplies some important information about the modems function. This is in addition to doing multiple pings to (or other server) and running

I've troubleshot issues with cable company. Now I'm struggling to contact Netgear to get there support, recalling the phone disconnect issues I had last time I tried to contact netgear (for a different product)

Manufacturer Response:

Hello Kend

If you are still having problems getting in touch with our support team at, please email us at We would more more than happy to help. In the email be sure to include any case numbers support gives you as well as a copy and paste of your review.



Did you find this review helpful? Yes No

  • Juan A.
  • 2/7/2014 10:02:36 AM
  • Tech Level: High
  • Ownership: 1 day to 1 week
  • Verified Owner

1 out of 5 eggsNot a very good product

Pros: Nice looking design.
If it works, it is fast. I can get slightly higher speeds than the 'upper' limit of my package.

Cons: Like other owners of this modem, I too am disappointed by the unreliability of this device. I've owned many other Netgear products and I have absolutely no complaints about them, they all work perfectly.
However this modem just keeps dropping its internet connection and requires disconnecting power to it and reconnecting it to make it work again.
I had TWC 30/5 meg service (Extreme) installed on February 1. It worked great for a couple of days and then started dropping connection on February 3. A tech came out and checked the line, he reported there's no problems with it, everything is were it should be. I would not necessarily had believed him if it wasn't for two things:
1) The amount of negative comments with the exact same issue that I have with this device.
2) I have a Motorola cable modem sitting right next to the Netgear. The Motorola is handling my home phone service only and has experienced absolutely no problem whatsoever, it is always connected.
Starting on February 6 (5 days after installation), the Netgear started dropping its connection several times a day (3 on Feb 6 and 3 so far at noon on Feb 7).

Other Thoughts: Do yourself a favor and avoid this product.
I've already ordered a Motorola cable modem to replace the Netgear. I'll RMA this guy as soon as I have the other one.
For comparison, at the time I write this the Netgear CMD31T has about 50-50 split between positive and negative reviews. But, the Motorola I'm replacing it with has 90% positive and only 10% negative reviews with far more people reviewing it than the Netgear.

Manufacturer Response:

Hello Enrique,

Our sincere apologies for the issues. We want to thank you for being a loyal NETGEAR customer and want to make sure you are satisfied. If you run into any more issues you can email us at Be sure to provide any case numbers that you have received from support as well as a copy and paste of your review.



Did you find this review helpful? Yes No

  • Keith L.
  • 1/30/2014 9:05:24 PM
  • Tech Level: Somewhat High
  • Ownership: less than 1 day
  • Verified Owner

5 out of 5 eggsNo problems

Pros: Works - no more TWC cable modem rental charges

Cons: None

Other Thoughts: Got this on sale and received in two days with standard (and free) shipping.

Opened box, connected coax, power, and PC via cat5. Called TWC, spoke with a nice rep, gave her the MAC address. Got her side working, then confirmed internet connection from mine. Reconfigured wireless router by cloning PC MAC address and released/renewed the DHCP. That was all there was to it.

Took about 30 minutes to an hour total. Would have been less, but I don't configure networks very often. I had to do a little research on the wireless setup. If you connect direct to the modem, it should just be a simple call to your cable ISP.

1 out of 2 people found this review helpful. Did you? Yes No

  • george g.
  • 12/28/2013 10:37:23 AM
  • Tech Level: Somewhat High
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsmodem 3.0 DOCSIS

Pros: great price, looks great, upright stand for heat dissipation.
provides maximum upstream/downstream speed tests.
working on an 25 gbps serivce from comcast/nj and receiving 28 gbps up and 8 gbps down. fairly impressed so far with the modem. temperature of the unit seems well mantained.

Cons: none so far

Did you find this review helpful? Yes No

  • Jason C.
  • 10/25/2013 2:04:16 AM
  • Tech Level: Somewhat Low
  • Ownership: 1 day to 1 week

2 out of 5 eggsRJ11 jack too shallow, does not click when cable inserted

Pros: None known.

Cons: Upon breaking it out of the box, I inserted the included RJ11 cable into the jack in the back of the unit. There was no audible or physical "click" noise that is often so recognized when inserting an RJ11 plug into its jack. The plug tag never locked into place and it could then be removed with an ever so slight tug. For me, this is unacceptable quality for a new item and I will be returning ASAP to the retailer where I purchased it from.

Manufacturer Response:

We can't apologize enough for your frustrations. If you have not yet returned the CMD31T please remember that our support team is only a click away at



1 out of 5 people found this review helpful. Did you? Yes No

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