product description page

NETGEAR DOCSIS 3.0 High Speed Cable Modem (CM400)

NETGEAR DOCSIS 3.0 High Speed Cable Modem (CM400) - image 1 of 1

About this item

Click to chat with an expert

The NETGEAR CM400 High Speed Cable Modem provides a connection to high-speed cable Internet, up to 340Mbps. It is CableLabs® certified and with DOCSIS® 3.0 is 8X faster than 2.0. It is compatible with U.S. cable Internet providers like Cablevision, Time Warner Cable®, XFINITY® & more.



Overall Width: 5.8 inches (W)
Weight: .44 ounces
Features: Gigabit Ethernet
Includes: Power Adapter, Ethernet Cable, Quick Start Guide
Number of Downstream Channels: 8
Number of Ethernet Ports: 1
DOCSIS compatibility: DOCSIS 3.0
Data Transfer Rate: Up to 343 Mbps
Product Depth: 1.8 inches
Connectivity: RJ-45 (Ethernet)
Warranty: 1 year limited warranty. To obtain a copy of the manufacturer's warranty for this item, please call Target Guest Services at 1-800-591-3869.
TCIN: 16346760
UPC: 606449103700
Item Number (DPCI): 056-02-0064
If the item details above aren’t accurate or complete, we want to know about it. Report incorrect product info.
MSRPReg: $69.99 Save $10.00 (14% off)

Guest reviews

overall: 2.6 out of 5 stars, see all reviews

Most recent reviews

No problems so far!

(would recommend)
5 out of 5 stars
Chelz 1 month ago
I just got this modem installed about a week ago and so far everything is running smoothly. I have about 5 devices that are connected to it and my home security uses the WiFi. I saw recent reviews about slow speeds but even with all my devices connected, I haven’t had any of these problems. I’m only...see moreof the reviewer's review
Do you find this helpful?
yes (0)no (0)report


(would not recommend)
1 out of 5 stars
Lucie 3 years ago
TWC tech installed the modem and within 1 hour of him leaving I checked the modem. The modem and coaxial cable connector were so hot I had to get oven mitts to touch it. If I had not checked it, it would have started a fire. called the cable company and was told this was a major defective product an...see moreof the reviewer's review
Do you find this helpful?
yes (7)no (8)report

AWFUL to be sure to ask when manufactured..VERY OLD FROM 2012

(would not recommend)
1 out of 5 stars
very frustrated 3 years ago
NEGATIVE ....and netgear makes it very difficult for you to register router.. Target should not be selling this old product or they and netgear need to think about a better customer experience.. AWFULLLL!!!
Do you find this helpful?
yes (3)no (17)report

A great alternative to paying your cable company to rent one

(would recommend)
5 out of 5 stars
Bill 3 years ago
Ultra-fast connectivity thanks for 8x4 technology, this modem will quickly pay for itself a few times over.see moreof the reviewer's review
Do you find this helpful?
yes (8)no (1)report

Prices, promotions, styles and availability may vary by store & online. See our price match guarantee. See how a store is chosen for you.