Romance University is reader-supported. When you buy through links on our site, we may earn an affiliate commission. Learn more

The Best cm400 modem of 2021 – Reviewed and Top Rated

After hours researching and comparing all models on the market, we find out the Best cm400 modem of 2021. Check our ranking below.

2,671 Reviews Scanned

Rank No. #1
NETGEAR Cable Modem CM400 Compatible with Cable Providers Xfinity by Comcast, Spectrum, Cox | For Cable Plans Up to 100 Mbps | DOCSIS3.0, Black (CM400-100NAS)
  • ELIMINATE MONTHLY CABLE MODEM RENTAL FEES - Up to $156 per year
  • DOCSIS 3. 0 Cable Modem with 1 Gigabit Ethernet port. One (1) Gigabit Ethernet port with auto-sensing technology
  • Up to 340Mbps download and upload speed. Separate router required for WiFi. 8x4 channel bonding.
  • DOCSIS 3. 0 unleashes 8x faster download speeds than DOCSIS 2. 0
  • Ideal for streaming HD videos, faster downloads, and high-speed online gaming
SaleRank No. #2
NETGEAR Cable Modem CM400 - Compatible with all Cable Providers including Xfinity by Comcast, Spectrum, Cox | For Cable Plans Up to 100 Mbps | DOCSIS 3.0, Black, 8x4 Cable Modem (CM400)
  • COMPATIBLE WITH ALL MAJOR CABLE INTERNET PROVIDERS: Including certification by Xfinity by Comcast, COX, and Spectrum. NOT compatible with Verizon, AT&T, CenturyLink, DSL providers, DirecTV, DISH and any bundled voice service.
  • SAVE MONTHLY RENTAL FEES: Model CM400 replaces your cable modem saving you up to $168/yr in equipment rental fees.
  • BUILT FOR SPEED: Best for cable provider plans up to 100 Mbps speed.
  • WORKS WITH ANY WiFi ROUTER: Connect any WiFi router to this modem's ethernet port to support all your wireless devices.
  • ETHERNET CONNECTIONS: 1 Gigabit Ethernet port connects to your computer or separate WiFi router.
Rank No. #3
ARRIS SURFboard SB6141-RB 8x4 DOCSIS 3.0 Cable Modem (Renewed)
  • Approved on Comcast Xfinity, Spectrum (Charter, Time Warner, Brighthouse Networks), Cox, Mediacom, Suddenlink and most other US Cable Internet Providers. NOT compatible with Verizon, AT&T or Centurylink. REQUIRES Internet Service.
  • Wired modem only. Does not include WiFi router or VOIP Telephone adapter. Gigabit Etherent port to connect to PC or Router.
  • 8 Download Channels and 4 Upload Channels capable of up to 343 Mbps download and 131 upload speeds. Recommended for Internet Plans up to 100 Mbps.
  • Supports both IPv4 and IPv6, the latest standard.
  • 90 Day Warranty. ARRIS Certified Refurbished. US Technical support. ARRIS Certified Refurbished products will ALWAYS be branded ARRIS, Never Motorola! If you get Motorola branded product they are illegitimate, need to be returned to Seller and Reported to Amazon
Rank No. #4
Accessory USA AC DC Adapter for Netgear CM400 CM400-100NAS CM400-1AZNAS DOCSIS 3.0 High Speed Cable Modem Power Supply Cord
  • Safety: Our Products are CE / FCC / RoHS certified, tested by the manufacturer to match and / or exceed the OEM specifications. OVP, OCP, SCP Protection (OVP: Over Voltage output Protection. OCP: Over Current output Protection. SCP: Short Circuit output Protection)
  • This Adapter is a Brand New, High Quality Never USED (non-OEM)
  • Compatiblity: AC DC Adapter For Netgear CM400 CM400-100NAS CM400-1AZNAS DOCSIS 3.0 High Speed Cable Modem Power Supply Cord
  • Note:please make sure the model of your device before buying
Rank No. #5
NETGEAR Renewed C3700-100NAR C3700-NAR DOCSIS 3.0 WiFi Cable Modem Router with N600 8x4 Download speeds. Certified for Xfinity from Comcast, Spectrum, Cox, Cablevision & More
  • Netgear Certified Refurbished product is manufacturer refurbished to work and look as new with 90 Day Warranty and email support. All accessories are included with limited documentation and additional information online. Netgear recommends to udpate the firmware for the device to be up to date.
  • DOCSIS 3.0 cable modem unleashes 8x faster download speeds up to 340 Mbps faster, smoother WiFi, and works with all major cable Internet providers (Not Compatible with Cable Bundled Voice Services).
  • Certified to work with Cable Internet Providers like XFINITY from Comcast, Time Warner Cable, Cox, Cablevision, Bright House Networks, & More (Not Compatible with Cable Bundled Voice Services).
  • 8x4 channel bonding with Gigabit Ethernet Ports for fast wired, connections USB port to wirelessly share your hard drive.Double firewall protection (SPI and NAT firewall)
  • "Netgear Refurbished product may have a removed serial number. You will need to state the product is refurbished (state the full part number) if emailing customer support. See the attached (image) flyer to obtain the Serial Number and MAC Address information that maybe needed by your Cable provider before contacting them."
Rank No. #6
PK Power AC/DC Adapter for Netgear CM400 CM400-100NAS CM400-1AZNAS DOCSIS 3.0 High Speed Cable Modem Power Supply Cord Cable PS Wall Home Charger Mains PSU
  • Input Volt Range: 100-259V (Worldwide Compliant)
  • Please confirm the specifications and plug size before purchasing!If you can't make sure, pls feel free to contact us
  • 119% Brand New, High Quality Power Charger/Adapter( Non-OEM ) Same Day Shipping from USA! COMPATIBILITY: Please see full list of compatible models in the Product Description
  • MONEY BACK GUARANTEE - We are USA based Company that Wants your Repeat Business so, if You Do Not Like our Product or Don't Want It For Any Reason, We Will Happily Accept The Return and Give You Your Money Back. No Questions Asked. 49 Days Money Back Guarantee
  • PK-Power products are CE / FCC / RoHS certified, tested by the manufacturer to match and / or exceed the OEM specifications OVP, OCP, SCP Protection (OVP: Over Voltage output Protection. OCP: Over Current output Protection. SCP: Short Circuit output Protection) PK-Power AC adapters manufactured with the highest quality materials and include safeguard features against incorrect voltage, short circuit, internal overheating. 119% compatibility with the original.
Rank No. #7
UpBright New AC/DC Adapter for Netgear CM400 CM400-100NAS CM400-1AZNAS DOCSIS 3.0 High Speed Cable Modem Power Supply Cord Cable PS Wall Home Charger Mains PSU
  • World Wide Input Voltage 100-240VAC 50/60Hz
  • OVP, OCP, SCP Protection (OVP: Over Voltage output Protection. OCP: Over Current output Protection. SCP: Short Circuit output Protection)
  • Tested Units. In Great Working Condition.
  • UpBright 30 days money back guarantee. 1 full year service warranty.
SaleRank No. #8
NETGEAR Cable Modem CM500 - Compatible with All Cable Providers Including Xfinity by Comcast, Spectrum, Cox | for Cable Plans Up to 300 Mbps | DOCSIS 3.0
  • Save monthly rental fees: Model CM500 replaces your cable modem, saving you up to $168/yr in equipment rental fees.
  • Built for fast speed: best for cable provider plans up to 300 Mbps speed.
  • Works with any wifi router: Connect any WiFi router to this modem's Ethernet port to support all your wireless devices.
  • Ethernet connections: 1 Gigabit Ethernet port connects to your computer or separate WiFi router.
  • Modem technology: Engineered with 16x4 channel bonding and DOCSIS 3.0.
Rank No. #9
NETGEAR Cable Modem CM600 - Compatible with Cable Providers Including Xfinity by Comcast, Spectrum, Cox | for Cable Plans Up to 400 Mbps | DOCSIS 3.0 | 24x8
  • Compatible with Comcast Xfinity, Time Warner Cable, Charter, Cox, Cablevision, and more. Requires Cable Internet Service
  • Not compatible with: Verizon, AT&T, or CenturyLink
  • Cable Modem only (no WiFi router).Memory: 8 MB NOR flash and 128 MB RAM
  • Support Cable Internet Service plans up to 300Mbps. Recommended for all speed tiers up to 500 Mbps. Separate router required for WiFi. 24x8 channel bonding
  • DOCSIS 3.0 Cable Modem with 1 Gigabit Ethernet port. DOCSIS 3.0 unleashes 8x faster download speeds than DOCSIS 2.0
Rank No. #10
NETGEAR CM500-1AZNAS (16x4) DOCSIS 3.0 Cable Modem, Max Download speeds of 686Mbps, Certified for Xfinity from Comcast, Spectrum, Cox, Cablevision & More (Renewed)
  • NETGEAR CM500-1AZNAS (16x4) DOCSIS 3.0 Cable Modem, Max download speeds of 686Mbps, Certified for Xfinity from Comcast, Spectrum, Cox, Cablevision & more (Renewed)

Last update on 2021-04-09 / Affiliate links / Product Titles, Images, Descriptions from Amazon Product Advertising API

How Do You Buy The Best cm400 modem?

Do you get stressed out thinking about shopping for a great cm400 modem? Do doubts keep creeping into your mind? We understand, because we’ve already gone through the whole process of researching cm400 modem, which is why we have assembled a comprehensive list of the greatest cm400 modem available in the current market. We’ve also come up with a list of questions that you probably have yourself.

We’ve done the best we can with our thoughts and recommendations, but it’s still crucial that you do thorough research on your own for cm400 modem that you consider buying. Your questions might include the following:

  • Is it worth buying an cm400 modem?
  • What benefits are there with buying an cm400 modem?
  • What factors deserve consideration when shopping for an effective cm400 modem?
  • Why is it crucial to invest in any cm400 modem, much less the best one?
  • Which cm400 modem are good in the current market?
  • Where can you find information like this about cm400 modem?

We’re convinced that you likely have far more questions than just these regarding cm400 modem, and the only real way to satisfy your need for knowledge is to get information from as many reputable online sources as you possibly can.

Potential sources can include buying guides for cm400 modem, rating websites, word-of-mouth testimonials, online forums, and product reviews. Thorough and mindful research is crucial to making sure you get your hands on the best-possible cm400 modem. Make sure that you are only using trustworthy and credible websites and sources.

We provide an cm400 modem buying guide, and the information is totally objective and authentic. We employ both AI and big data in proofreading the collected information. How did we create this buying guide? We did it using a custom-created selection of algorithms that lets us manifest a top-10 list of the best available cm400 modem currently available on the market.

This technology we use to assemble our list depends on a variety of factors, including but not limited to the following:

  1. Brand Value: Every brand of cm400 modem has a value all its own. Most brands offer some sort of unique selling proposition that’s supposed to bring something different to the table than their competitors.
  2. Features: What bells and whistles matter for an cm400 modem?
  3. Specifications: How powerful they are can be measured.
  4. Product Value: This simply is how much bang for the buck you get from your cm400 modem.
  5. Customer Ratings: Number ratings grade cm400 modem objectively.
  6. Customer Reviews: Closely related to ratings, these paragraphs give you first-hand and detailed information from real-world users about their cm400 modem.
  7. Product Quality: You don’t always get what you pay for with an cm400 modem, sometimes less, and sometimes more.
  8. Product Reliability: How sturdy and durable an cm400 modem is should be an indication of how long it will work out for you.

We always remember that maintaining cm400 modem information to stay current is a top priority, which is why we are constantly updating our websites. Learn more about us using online sources.

If you think that anything we present here regarding cm400 modem is irrelevant, incorrect, misleading, or erroneous, then please let us know promptly! We’re here for you all the time. Contact us here. Or You can read more about us to see our vision.