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Netgear Inc. > 
Item#: N82E16825124006

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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  • 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.

Did you find this review helpful? 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

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  • 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



0 out of 3 people found this review helpful. Did you? Yes No

  • jason m.
  • 10/8/2013 6:49:12 AM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

1 out of 5 eggs

Pros: Can't think of any

Cons: Does not work all the time. I keep getting disconnected from the internet. My ISP is Mediacom and they keep telling me its on my end. I went back to paying them an additional $5 a month to rent their modem and Don't have the same issue. TOO MUCH OF A HASSLE so DON'T buy it

Manufacturer Response:

We would like to figure out what is causing your CMD31T to disconnect, please contact our support team at They will be happy to assist you. We apologize for the inconvenience and hope that you will reach out to us soon.



0 out of 4 people found this review helpful. Did you? Yes No

  • Marvin L.
  • 10/1/2013 12:04:32 PM
  • Tech Level: High
  • Ownership: 1 week to 1 month

1 out of 5 eggsComcast = Terrible

Pros: Speed when working.

Cons: Does not work for Comcast, even though it is sold with the logo on the box - and is on Comcast's approved internet devices list. After spending weeks of provisioning this modem over and over, I got fed up. Netgear lost a long time customer.

Other Thoughts: Don't buy this device, it does not work and causes more headaches than its worth.

Manufacturer Response:

Please get in contact with our support team right away-- we want nothing more than to keep you as a loyal NETGEAR customer.

You can reach our support team at

If for some reason they are unable to help, then please contact us directly at with a copy and paste of your review and any case numbers you receive from support.

Our sincere apologies,


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

  • Robert G.
  • 9/19/2013 5:58:04 PM
  • Tech Level: Average
  • Ownership: 1 week to 1 month
  • Verified Owner

1 out of 5 eggsStopped working

Pros: Received package very promptly. Just in time foe TimeWarner Cable (TWC) installer.

Cons: Could not get it to function. I finally, in desperation, had to agree to use their modem, for an extra $5.99 + fees/ month. I did get it to work, reluctantly (according to my church buddy tech-weenie, for 4 days. TWC even had this on their "compatible" list.

Other Thoughts: I will try again w/ the MOTOROLA SurfBoard nnn, but it is tremendously frustrating.
I believe in Newegg's products & services & chalk this up to just bad product... It happens, but it is frustrating.

Did you find this review helpful? Yes No

  • Steven B.
  • 9/8/2013 1:31:57 PM
  • Tech Level: High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsGreat modem

Pros: -Good solid bandwidth
-Works well with Netgear Router (WNDR3400)
-Actually improved bandwidth by roughly 10%
-Replaced a Ubee modem. That Ubee would get into weird states where I'd have some horrible lag or bandwidth roughly once every week or two. I'd have to power cycle the Ubee to resolve it. This modem has gone for at least 4 weeks without needing a power cycle.

Cons: -Only available in white
-Not sure if some measurements work correctly (see other thoughts)

Other Thoughts: I bought this router around 2 months ago when I saw TWC was bumping up modem lease rates again. Minus dealing with unhelpful TWC support folks, setting this thing up was a breeze.

There were a few issues that I had and I will describe them here for a forewarning or to help debug:

The first day I got everything connected, all of my devices worked great. The next day when I got home from work, the modem had lost connection with the network (TWC doesn't see it). I rebooted thinking something messed up on TWCs end. Worked great. Every day the modem would drop out. At first it seemed to be every 24 hrs, but looking at the logs, sometimes it would vary, but the time always seemed to be in the afternoon. Leading me to believe it wasn't some sort of DHCP issue with TWC. Looking at the levels I noticed the upstream power level was sitting right at 50dBmV. That was borderline high, so I changed a 1-to-2 splitter to a 1-to-4. Modem would stay connected after that. I just recently moved to a new home and when TWC came up to move my service, the tech (who was actually smart and nice) told me that I had unbelievably good signals at my house. All I can think of is that the upstream power was just on a border where everyday around 3-5pm when equipment or lines get hotter (this was during summer) that it would trip the receiving end and cause it to lose range.

I can't take an egg off for this thing outputting too much power. Most homes with bad connections probably need that boost anyways.

The only weird thing I saw was that when I changed the splitter, the upstream power actually went up by 7dBmV. I know this is an "Estimated" value sometimes so I'm not putting that much faith in it. If you really need to know, call your ISP and they should be able to tell you. After it started working I gave up on investigating it and got back to streaming and Xbox'ing.

Overall a great modem.

3 out of 3 people found this review helpful. Did you? Yes No

  • Mitch B.
  • 8/31/2013 6:12:08 PM
  • Tech Level: Average
  • Ownership: 1 week to 1 month
  • Verified Owner

1 out of 5 eggsGreat when working

Pros: Docsis 3
Compatible with Time Warner
Easy to install/setup

Cons: Constantly drops the internet connection, would go entire days without making a connection. The light would just blink away. I had the internet company out to try and fix the problem twice this month. I am going to return and look elsewhere for a cable modem.

Manufacturer Response:


You can get in contact with our support team for assistance-- they will be glad to help.

We apologize for the issues and hope to get this issue resolved as soon as possible.



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

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Item#: N82E16825124006
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