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NETGEAR

NETGEAR Nighthawk CM3000 DOCSIS 3.1 Cable Modem for Xfinity, Cox & Spectrum

  • Based on 466 reviews
Condition: New
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Availability: In Stock.
Fulfilled by Amazon
Arrives Tuesday, Oct 6
Order within 21 hours and 14 minutes
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Style: (NEW) 2.5 Gbps


Features

  • FASTEST DOCSIS 3.1 SPEEDS WITH MID/HIGH-SPLIT: Revolutionary mid/high-split technology delivers up to 2.5Gbps download and 1Gbps upload, unlocking your provider's fastest tiers such as Xfinity Gigabit+ and its faster upstream, far beyond what standard cable modems reach.
  • STRONG PERFORMANCE ON XFINITY, SPECTRUM & COX: Works with all major U.S. cable internet providers and is backward compatible with DOCSIS 3.0. Cable internet only, not for DSL, fiber, or bundled cable-voice plans.
  • QUICK SETUP, ROCK-SOLID CONNECTION: Get online in minutes and enjoy stable, low-latency performance for gaming, 4K streaming and video calls, powered by DOCSIS 3.1 Active Queue Management and OFDMA.
  • MULTI-GIG PORTS WITH LINK AGGREGATION: One 2.5Gbps Ethernet port for multi-gig plans, plus two 1Gbps ports with link aggregation for up to 2Gbps wired, the most connectivity in its class.
  • SAVE UP TO $300 A YEAR, MODEM ONLY: Buy your own high-performance cable modem instead of renting and cut monthly ISP fees. No built-in WiFi, so pair with a NETGEAR Nighthawk WiFi 6E/7 router or Orbi system for whole-home coverage.

Description

Upgrade to faster speeds with the revolutionary DOCSIS® 3.1 mid/high-split cable modem from NETGEAR. The Nighthawk® CM3000 cable modem is specifically engineered to handle today’s fastest DOCSIS 3.1 cable internet speeds that can only be accessed with mid/high-split technology, such as Xfinity’s 2Gbps Internet download speeds and 200Mbps upload speeds. Your entire family can enjoy faster download speeds up to 2.5Gbps and unprecedented upload speeds up to 1Gbps for lag-free gaming, crisp video conferencing, smoother music and video streaming, and instant app downloads. And to push your Nighthawk’s performance even further, you can simply pair the CM3000 with a NETGEAR WiFi 6E or WiFi7 router or with our amazing Orbi system. The Nighthawk CM3000 works seamlessly with every major U.S. cable service provider.

Brand: NETGEAR


Internet service provider: spectrum, optimum, cox, xfinity, and more


Connectivity Technology: Ethernet


Compatible Devices: Router


Product Dimensions: 6.8"L x 3.7"W x 8.2"H


Brand: NETGEAR


Internet Service Provider: spectrum, optimum, cox, xfinity, and more


Modem Type: Cable


UPC: 606449157185


Unit Count: 1 Count


Item Highlight: Mid/high-split unlocks up to 2.5Gbps download & 1Gbps upload; 2.5G + two 1G ports with link aggregation; modem only, no WiFi


Manufacturer: NETGEAR


Number of Items: 1


Built-In Media: Nighthawk High-Split 2.5Gbps Internet Speed Cable Modem (CM3000), One (1) Ethernet cable, Power adapter, Quick install guide


Item Weight: 1.1 pounds


Model Number: CM3000-100NAS


Mfr Part Number: CM3000-100NAS


Warranty Description: 1 Year Limited


Connectivity Technology: Ethernet


Compatible Devices: Router


Number of Ports: 2


Maximum Downstream Data Transfer Rate: 1 gigabits_per_second


Maximum Upstream Data Transfer Rate: 1000 megabits_per_second


Data Transfer Rate: 1000 megabits_per_second


Number of Ethernet Ports: 2


Item Dimensions L x W x H: 6.8"L x 3.7"W x 8.2"H


Color: Black


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Tuesday, Oct 6

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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  • Financing through Google Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • CM3000: A Smart Upgrade Over Renting an Xfinity Modem
After researching my options, I decided to stop renting Xfinity’s modem and purchase the CM3000 instead—and it has already proven to be a smart financial move. Instead of paying monthly rental fees, I now own a high-performance modem that quickly pays for itself in savings over time. Setup was simple, and the CM3000 has delivered consistently fast, stable, and reliable performance. It easily supports my entire home without interruptions, even with multiple devices streaming, gaming, and working simultaneously. If you’re considering switching from a rental modem, I highly recommend the CM3000—it offers excellent performance, greater control, and significant long-term savings. ... show more
Reviewed in the United States on July 26, 2026 by Jeffrey Updike
    • Updated/Upgraded My Wi-Fi Network
With a router and a modem approaching the age of 4-5 years old, it was time to update/upgrade my network with a bit of future proofing in mind. After doing my due diligence to pair my recently updated router, I decided to go with the Netgear Nighthawk CM3000. The equipment is compatible with my ISP Cox Cable plus supports DOCSIS 3.1. Setup was easy with uncomplicated connections to my ISP and router. A quick call to Cox Cable to activate the modem onto their network was a breeze. After one week of use, the system has been very stable, reliable with no interruptions. I’ve most definitely noticed and enjoyed quicker loading speeds as well as much better latency while experiencing much less buffering during streaming live programming. Time will tell if this CM3000 will provide solid performance over the next 4-5 years before advancing technology encourages me to update/upgrade my network again. With the 12 month warranty, I figure if anything is wrong with the unit, a problem will likely happen in the first few months. I’ll report back if I experience any problems. Very happy so far. ... show more
Reviewed in the United States on July 6, 2026 by Steevo
    • Very Capable Modem!
Great device that boosted connection speeds. My old modem was too slow to take advantage of increased speed, but this one takes full advantage. I connected it to my existing WiFi 6 mesh router and everything runs so much better.
Reviewed in the United States on June 28, 2026 by Retired Wine Lawyer
    • Avoid NETGEAR. You were warned.
My issue with this: not even a year, and this $300 modem is making scratching noise. There is no fan so you know it is an electrical component. CHEAP electrical component. This I believe, is objectively the most expensive modem of this class. You'd think, "no problem, it has 1 year warranty". And here is my issue with NETGEAR Support. 1. Discourages return/replacement by decoupling warranty with "support". - One year HARDWARE warranty, but only 90 day SUPPORT. I cannot freaking reach a hardware warranty resolution because it keeps asking me to pay for support. I should not have to pay support to exercise hardware warranty. They deliberately make it hard to contact them for RMA. 2. Discourages return/replacement by returning 404/500/"Page not found" in related RMA pages. - No freaking way. How can they get away with this? Every dead link and extra hoop shakes off the percentage of claimants, and THEY KNOW IT. 3. Discourages return/replacement by making you "internet-less" for a long time. - A modem maker should know that asking for your modem first before issuing a replacement is a dumb, as that means you'd be out of internet while take their sweet sweet time to replace your device. Especially on cases where it is still kinda working, but you know it is failing. 4. Discourages return/replacement by knowing you'd get another refurb or busted unit. - So what's the point again of warranty? Please do yourself a favor. Get a cheaper brand because this one will fail anyway. Or better yet, get from a more reputable brand, if there is any. ... show more
Reviewed in the United States on August 14, 2026 by Jay Mendoza
    • Solved The Issues
I had bought a new laptop and was having issues that I thought would mean returning it. It would show that I had great connection to the router but no wifi. I constantly had to refresh to make it connect. Thought it was the laptop, but then it started happening on other devices. My old modem was 5 years old. I started thinking maybe that was the problem, so I decided to upgrade that before blaming my devices. This modem was easy to activate through the internet provider's app. Lo and behold - it solved all the connection issues. Devices that connect to my wifi are buzzing along now. So, it was just a case of my old modem not being up to the task anymore. The old modem was also a Netgear. I was pleased with the service I got from it, so when it was time to upgrade I went with Netgear again. Very pleased with the results. ... show more
Reviewed in the United States on April 26, 2026 by GAGA54
    • Good modem upgarde - call service provider to register modem - not Netgear.
I learned my Motorola modem was no longer secure and suseptable to malware/ could not be updated. I bought this and know how to connect it all. Consumers may not want to waste time contacting Netgear - and contact the service provider to connect/ register the modem. I wasted time with someone who had no idea what he was talking about. My service is now faster/ better and more secure. ... show more
Reviewed in the United States on July 27, 2026 by Donna Marie
    • Great modem
Easy to set up and does an excellent job. Internet much improved after getting this modem.
Reviewed in the United States on June 16, 2026 by Bruce L. Blanford
    • Easy setup! So far works great for what we need! 4500 squ foot home
Easy Peasy. Check all install info first.
Reviewed in the United States on July 20, 2026 by RMS

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