20 Best Cable Modem Sb6121 [2024]

Are you looking for the best cable modem sb6121? Based on expert reviews, we ranked them. We've listed our top-ranked picks, including the top-selling cable modem sb6121.

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# Preview Product
1 motorola Surfboard SB6121 Cable Modem (Renewed) motorola Surfboard SB6121 Cable Modem (Renewed)
2 ARRIS SURFboard SB6121 4x4 DOCSIS 3.0 Cable Modem -Retail Packaging-Black ARRIS SURFboard SB6121 4x4 DOCSIS 3.0 Cable Modem -Retail Packaging-Black
3 ARRIS SURFboard SB6190 DOCSIS 3.0 32 x 8 Gigabit Cable Modem | Comcast Xfinity, Cox, Spectrum | 1... ARRIS SURFboard SB6190 DOCSIS 3.0 32 x 8 Gigabit Cable Modem | Comcast Xfinity, Cox, Spectrum | 1...
4 motorola Surfboard SB6121 Cable Modem motorola Surfboard SB6121 Cable Modem
5 T-Power 12v AC DC Adapter Compatible with Comcast Xfinity Motorola Surfboard SBG6700AC SBG6580... T-Power 12v AC DC Adapter Compatible with Comcast Xfinity Motorola Surfboard SBG6700AC SBG6580...
6 Motorola Surfboard SB6141 DOCSIS 3.0 High-Speed Cable Modem- Black (OEM Brown Box) Motorola Surfboard SB6141 DOCSIS 3.0 High-Speed Cable Modem- Black (OEM Brown Box)
7 ARRIS SURFboard SB6121 4x4 DOCSIS 3.0 Cable Modem (Renewed)-Black ARRIS SURFboard SB6121 4x4 DOCSIS 3.0 Cable Modem (Renewed)-Black
8 Motorola MB7621 Cable Modem | Pairs with Any WiFi Router | Approved by Comcast Xfinity, Cox, and... Motorola MB7621 Cable Modem | Pairs with Any WiFi Router | Approved by Comcast Xfinity, Cox, and...
9 ARRIS Surfboard S33 DOCSIS 3.1 Multi-Gigabit Cable Modem | Approved for Comcast Xfinity, Cox,... ARRIS Surfboard S33 DOCSIS 3.1 Multi-Gigabit Cable Modem | Approved for Comcast Xfinity, Cox,...
10 ARRIS SURFboard SB8200 DOCSIS 3.1 Cable Modem | Approved for Comcast Xfinity, Cox, Charter Spectrum,... ARRIS SURFboard SB8200 DOCSIS 3.1 Cable Modem | Approved for Comcast Xfinity, Cox, Charter...
11 ARRIS SURFboard SBG10 DOCSIS 3.0 16 x 4 Gigabit Cable Modem & AC1600 Wi-Fi Router | Comcast Xfinity,... ARRIS SURFboard SBG10 DOCSIS 3.0 16 x 4 Gigabit Cable Modem & AC1600 Wi-Fi Router | Comcast...
12 NETGEAR Cable Modem CM1000 - Compatible with All Cable Providers Including Xfinity by Comcast,... NETGEAR Cable Modem CM1000 - Compatible with All Cable Providers Including Xfinity by Comcast,...
13 Google Wifi - AC1200 - Mesh WiFi System - Wifi Router - 4500 Sq Ft Coverage - 3 pack Google Wifi - AC1200 - Mesh WiFi System - Wifi Router - 4500 Sq Ft Coverage - 3 pack
14 MOTOROLA 16x4 Cable Modem, Model MB7420, 686 Mbps DOCSIS 3.0, Certified by Comcast XFINITY, Charter... MOTOROLA 16x4 Cable Modem, Model MB7420, 686 Mbps DOCSIS 3.0, Certified by Comcast XFINITY,...
15 Motorola MG8702 | DOCSIS 3.1 Cable Modem + Wi-Fi Router (High Speed Combo) with Intelligent Power... Motorola MG8702 | DOCSIS 3.1 Cable Modem + Wi-Fi Router (High Speed Combo) with Intelligent Power...
16 Motorola MG7700 Modem WiFi Router Combo with Power Boost | Approved by Comcast Xfinity, Cox and... Motorola MG7700 Modem WiFi Router Combo with Power Boost | Approved by Comcast Xfinity, Cox and...
17 Netgear Nighthawk Cable Modem WiFi Router Combo C7000-Compatibility Cable Providers including... Netgear Nighthawk Cable Modem WiFi Router Combo C7000-Compatibility Cable Providers including...
18 ARRIS SURFboard T25 DOCSIS 3.1 Gigabit Cable Modem | Comcast Xfinity Internet & Voice | Two 1 Gbps... ARRIS SURFboard T25 DOCSIS 3.1 Gigabit Cable Modem | Comcast Xfinity Internet & Voice | Two 1...
19 NETGEAR Renewed C3700-100NAR C3700-NAR DOCSIS 3.0 WiFi Cable Modem Router with N600 8x4 Download... NETGEAR Renewed C3700-100NAR C3700-NAR DOCSIS 3.0 WiFi Cable Modem Router with N600 8x4 Download...
20 TP-Link ER605 | Multi-WAN Wired VPN Router | Up to 4 Gigabit WAN Ports | SPI Firewall SMB Router |... TP-Link ER605 | Multi-WAN Wired VPN Router | Up to 4 Gigabit WAN Ports | SPI Firewall SMB Router...
Bestseller No. 1
motorola Surfboard SB6121 Cable Modem (Renewed)
  • This refurbished product is tested and certified to look and work like new. The refurbishing process includes functionality testing, basic cleaning,...
Bestseller No. 2
ARRIS SURFboard SB6121 4x4 DOCSIS 3.0 Cable Modem -Retail Packaging-Black
  • Compatible with Time Warner Cable, Charter, Cox, Cablevision, and more
  • Not compatible with Verizon FiOS or AT&T U-verse, no longer approved by Comcast Xfinity
  • Requires Cable Iternet Service, if not sure your provider is CABLE call them to confirm
  • BROWN BOX models NOT VALID for this item when sold as New, should report to Amazon immediately and RETURN to Seller
  • Wired modem only, does NOT include WIFI Router or VOIP Telephone adapter. Gigabit Ethernet port to connect to computer or Router for fast downloads.
SaleBestseller No. 3
ARRIS SURFboard SB6190 DOCSIS 3.0 32 x 8 Gigabit Cable Modem | Comcast Xfinity, Cox, Spectrum | 1...
  • A Trusted Name in Home Connectivity: Better connectivity, better speed. The ARRIS SURFboard SB6190 DOCSIS 3.0 Cable Modem is designed to bring you...
  • Save Money: Own your modem and save. Reduce your cable bill up to $168 dollars per year in cable modem rental fees (Savings vary by cable service...
  • Modem Technology: DOCSIS 3.0 is an reliable, broadly available, and affordable technology that delivers high speed internet to your home devices.
  • Simple and Secure Set-up: Plug-in the device, download the SURFboard Central App, and follow the instructions to activate the modem. Connect to a...
  • Compatibility: The SURFboard SB6190 is compatible with major U.S. cable internet providers including Cox, Spectrum, Xfinity and others. It's approved...
SaleBestseller No. 4
motorola Surfboard SB6121 Cable Modem
  • This refurbished product is tested and certified to look and work like new. The refurbishing process includes functionality testing, basic cleaning,...
SaleBestseller No. 5
T-Power 12v AC DC Adapter Compatible with Comcast Xfinity Motorola Surfboard SBG6700AC SBG6580...
  • T-Power - manufactured with Brand-new Input Voltage Range: AC 100V - 240V (12V )
  • Compatible Models: Motorola ARRIS SURFboard SB6190 SB6183 Sb5100 ,Comcast Xfinity Motorola Surfboard ARRIS SURFboard SBG6700AC SBG6700-AC SBG6580...
  • Belkin Wireless Router N150 N300 N450 N600 N750; Netgear N150 N600 N300; ,, MOTOROLA 579765-003 2247-N8 ADSL 2,2+ Wireless-N Modem Gateway - Black ,,...
  • Motorola SB6120 Cable Modem SURFboard eXtreme SBG6580 SURFboard Wireless Cable Modem Gateway Ethernet SBG901 556315-005-00 SURFboard Gateway DOCSIS...
Bestseller No. 6
Motorola Surfboard SB6141 DOCSIS 3.0 High-Speed Cable Modem- Black (OEM Brown Box)
  • 10/100/1000 Mbps Ethernet port to connect with router or computer
  • DOCSIS 3.0 certified, capable of up to 343 Mbps and upload speeds up to 131 Mbps based on Cable provider service
  • Compatible with all major CABLE providers like Comcast/Xfinity, Cox, Charter, Time Warner, Mediacom, Bright House. Call your ISP to verify...
  • Compatible with Windows, Macintosh and UNIX computers
  • Front-panel LEDs indicate status and simplify troubleshooting
Bestseller No. 7
ARRIS SURFboard SB6121 4x4 DOCSIS 3.0 Cable Modem (Renewed)-Black
  • This Certified Refurbished product is manufacturer refurbished, shows limited or no wear, and includes all original accessories plus a 90-day...
  • Requires CABLE Internet Service, if not sure your provider is CABLE call them to confirm. Does NOT work with Charter cable provider.
  • Compatible with MOST Major CABLE providers like Comcast/Xfinity, Cox, Time Warner, Mediacom, Bright House.
  • Wired modem only, does NOT include WIFI Router or VOIP Telephone adapter. Gigabit Ethernet port to connect to computer or Router for fast downloads.
  • Internet download speeds up to 172 Mbps and upload speeds up to 131 Mbps based on your Cable provider service. Good for streaming Video and gaming on...
SaleBestseller No. 8
Motorola MB7621 Cable Modem | Pairs with Any WiFi Router | Approved by Comcast Xfinity, Cox, and...
  • Model MB7621 is recommended for actual cable Internet service speeds up to 650 Mbps. Wirecutter rates this “the best modem for most people.” A...
  • This cable modem's 1 Gigabit Ethernet port connects to a WiFi router, computer, HDTV, game station, or streaming video device. Great for use with...
  • Requires cable Internet service.Approved by and for use with Comcast Xfinity and Xfinity X1, Cox, Charter Spectrum, Time Warner Cable, BrightHouse,...
  • Setup is fast and easy using the quick start guide.
  • Attractive, compact design minimizes shelf space, improves cooling, and extends product life while looking great in any home or office. A 2-year...
SaleBestseller No. 9
ARRIS Surfboard S33 DOCSIS 3.1 Multi-Gigabit Cable Modem | Approved for Comcast Xfinity, Cox,...
  • A Trusted Name in Home Connectivity: Better connectivity, better speed. The ARRIS SURFboard S33 DOCSIS 3.1 Cable Modem is designed to bring you...
  • Save Money: Own your modem and save. Reduce your cable bill up to $168 dollars per year in cable modem rental fees (Savings vary by cable service...
  • Modem Technology: DOCSIS 3.1 is the newest technology available from cable internet providers. Its 10x faster than DOCSIS 3.0, provides better...
  • Simple and Secure Set-up: Plug-in the device, download the SURFboard Central App, and follow the instructions to activate the modem. Connect to a...
  • Compatibility: The SURFboard S33 is compatible with major U.S. cable internet providers including Cox (Gigablast), Spectrum (Internet Gig), Xfinity...
SaleBestseller No. 10
ARRIS SURFboard SB8200 DOCSIS 3.1 Cable Modem | Approved for Comcast Xfinity, Cox, Charter Spectrum,...
  • A Trusted Name in Home Connectivity: Better connectivity, better speed. The ARRIS SURFboard SB8200 DOCSIS 3.1 Cable Modem is designed to bring you...
  • Save Money: Own your modem and save. Reduce your cable bill up to $168 dollars per year in cable modem rental fees (Savings vary by cable service...
  • Modem Technology: DOCSIS 3.1 is the newest technology available from cable internet providers. Its 10x faster than DOCSIS 3.0, provides better...
  • Simple and Secure Set-up: Plug-in the device, download the SURFboard Central App, and follow the instructions to activate the modem. Connect to a...
  • Compatibility: The SURFboard SB8200 is compatible with major U.S. cable internet providers including Cox (Gigablast), Spectrum (Internet Gig), Xfinity...
SaleBestseller No. 11
ARRIS SURFboard SBG10 DOCSIS 3.0 16 x 4 Gigabit Cable Modem & AC1600 Wi-Fi Router | Comcast Xfinity,...
  • A Trusted Name in Home Connectivity: Get high speeds, better coverage, and a two-in-one product! With the ARRIS SURFboard SBG10 Wi-Fi Cable Modem, you...
  • Save Money: Own your modem and save. Reduce your cable bill up to $168 dollars per year in cable modem rental fees (Savings vary by cable service...
  • Modem Technology: DOCSIS 3.0 is a reliable, broadly available, and affordable technology that delivers high speed internet to your home devices.
  • Simple and Secure Set-up: Just plug-in, download the SURFboard Central App, and follow the step-by-step intrstuctions to activate the modem, set-up...
  • Compatibility: The SURFboard SBG10 is compatible with major U.S. cable internet providers including Cox, Spectrum, Xfinity and others. It's approved...
SaleBestseller No. 12
NETGEAR Cable Modem CM1000 - Compatible with All Cable Providers Including Xfinity by Comcast,...
  • Compatible with all major cable internet providers with internet speed up to 1Gbps. Currently certified with Spectrum and Cox (up to 1Gbps), Xfinity...
  • Save monthly rental fees: Model CM1000 replaces your cable modem saving you up to dollar 168/year in equipment rental fees.
  • Works with any Wi-Fi router: Connect any Wi-Fi 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 Wi-Fi router.
SaleBestseller No. 13
Google Wifi - AC1200 - Mesh WiFi System - Wifi Router - 4500 Sq Ft Coverage - 3 pack
  • Google Wifi is a scalable flexible mesh Wifi system that blankets your home in reliable coverage and keeps buffering at bay; 1 Google Wifi point...
  • Google Wifi gives you whole home coverage; 1 Pack covers up to 1500 square feet and 3 Pack covers up to 4500 square feet; points work together to...
  • Intelligently works behind the scenes to make sure your Wifi remains fast so you can stream with speed[2]
  • Simple setup in a few steps; use the Google Home app to create your network and get online in minutes[3]
  • Parental controls let you manage screen time, restrict certain kinds of adult content, and pause Wifi to specific devices on your mesh network...
Bestseller No. 14
MOTOROLA 16x4 Cable Modem, Model MB7420, 686 Mbps DOCSIS 3.0, Certified by Comcast XFINITY, Charter...
  • This 16x4 DOCSIS 3.0 cable modem provides speeds up to 686 Mbps, sixteen times faster than DOCSIS 2.0. A Full-Band Capture digital tuner ensures a...
  • Cable modem's Ethernet port connects to a computer, HDTV, game station, or wireless router. (This Model MB7420 cable modem does NOT have a built-in...
  • Requires cable Internet service. Certified by Comcast XFINITY for residential speeds up to Extreme 300, by Comcast Business for speeds up to Deluxe...
  • Setup is fast and easy with a few quick steps set out in a Quick Start guide. Experienced USA-based customer support specialists are there to help if...
SaleBestseller No. 15
Motorola MG8702 | DOCSIS 3.1 Cable Modem + Wi-Fi Router (High Speed Combo) with Intelligent Power...
  • Instantly upgraded you WiFi performance with advanced tech all while saving up to $168 per year in rental fees by owning your cable modem.
  • Access the fastest cable internet plans available, with the future-proof performance of the DOCSIS 3.1 cable modem.
  • Includes a built-in high speed AC3200 WiFi router with Power Boost, Range Boost, and AnyBeam WiFi Beamforming for ultra fast, reliable WiFi.
  • Intelligent mobile app - Comes with a smart WiFi app for easy setup, guest network management, usage monitoring, speed testing, parental controls,...
  • Reliability you can count on - A worldwide leader in technology people depend on. Comes with 2-years of free expert support from our team
SaleBestseller No. 16
Motorola MG7700 Modem WiFi Router Combo with Power Boost | Approved by Comcast Xfinity, Cox and...
  • Fast 24x8 DOCSIS 3.0 cable Modem Plus a built-in AC1900 Dual band (2.4GHz and 5GHz) Wi-Fi Gigabit Router with four Gigabit (GigE) Ethernet ports,...
  • Eliminate up to 156 dollars per year in cable Modem rental fees. (Savings are shown for Comcast Xfinity and vary by cable service provider.) certified...
  • Built-in high-speed router with AC1900 wireless and Power boost - Provides internet access for Wi-Fi devices including smartphones, notebooks,...
  • Wireless power boost for better speed and range - Adds high-performance Wi-Fi power amplifiers to boost the wireless signals to the legal limit,...
Bestseller No. 17
Netgear Nighthawk Cable Modem WiFi Router Combo C7000-Compatibility Cable Providers including...
  • input voltage:120 -240V
  • COMPATIBLE WITH ALL MAJOR CABLE INTERNET PROVIDERS: Including certification by Xfinity by Comcast, COX, and Spectrum. NOT compatible with Verizon,...
  • SAVE MONTHLY RENTAL FEES: Model C7000 replaces your cable modem and WiFi router saving you up to $150/yr in equipment rental fees. System Requirements...
  • BUILT FOR FAST SPEED: Best for cable provider plans up to 400 Mbps speed
  • FAST Wi Fi PERFORMANCE: Get up to 1800 sq ft wireless coverage and 30 devices connected with AC1900 speed (up to 1900 Mbps)
SaleBestseller No. 18
ARRIS SURFboard T25 DOCSIS 3.1 Gigabit Cable Modem | Comcast Xfinity Internet & Voice | Two 1 Gbps...
  • A Trusted Name in Home Connectivity: Better connectivity, better speed. The ARRIS SURFboard T25 DOCSIS 3.1 Cable Modem is designed to bring you...
  • Save Money: Own your modem and save. Reduce your cable bill up to $168 dollars per year in cable modem rental fees. For use with Xfinity Internet &...
  • Modem Technology: DOCSIS 3.1 is the newest technology available from cable internet providers. Its 10x faster than DOCSIS 3.0, provides better...
  • Simple and Secure Set-up: Plug-in the device, download the SURFboard Central App, and follow the instructions to activate the modem. Connect to a...
  • Compatibility: The SURFboard T25 is compatible with Xfinity Internet & Voice service and is approved for cable internet speed plans up to 800 Mbps.
Bestseller No. 19
NETGEAR Renewed C3700-100NAR C3700-NAR DOCSIS 3.0 WiFi Cable Modem Router with N600 8x4 Download...
  • Netgear Certified Refurbished product is manufacturer refurbished to work and look as new with 90 Day Warranty and email support. All accessories are...
  • 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...
  • Certified to work with Cable Internet Providers like XFINITY from Comcast, Time Warner Cable, Cox, Cablevision, Bright House Networks, & More (Not...
  • 8x4 channel bonding with Gigabit Ethernet Ports for fast wired, connections USB port to wirelessly share your hard drive.Double firewall protection...
  • "Netgear Refurbished product may have a removed serial number. You will need to state the product is refurbished (state the full part number) if...
Bestseller No. 20
TP-Link ER605 | Multi-WAN Wired VPN Router | Up to 4 Gigabit WAN Ports | SPI Firewall SMB Router |...
  • Five Gigabit Ports — 1 Gigabit WAN Port plus 3 Gigabit WAN/LAN Ports plus 1 Gigabit LAN Port. Up to four WAN ports optimize bandwidth usage through...
  • Integrated into Omada SDN — Omada’s Software Defined Networking (SDN) platform integrates network devices including gateways, access points and...
  • Cloud Access — Remote Cloud access and Omada app brings centralized cloud management of the whole network from different sites—all controlled from...
  • SDN Compatibility — For SDN usage, make sure your devices/controllers are either equipped with or can be upgraded to SDN version. SDN controllers...
  • Abundant Security Features — Advanced firewall policies, DoS defense, IP/MAC/URL filtering, speed test and more security functions protect your...

Having trouble finding a great cable modem sb6121?

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After hours of searching and using all the models on the market, we have found the best cable modem sb6121 for 2023. See our ranking below!

How Do You Buy The Best Cable Modem Sb6121?

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We understand, because we’ve already gone through the whole process of researching cable modem sb6121, which is why we have assembled a comprehensive list of the greatest cable modem sb6121 available in the current market. We’ve also come up with a list of questions that you probably have yourself.

John Harvards has done the best we can with our thoughts and recommendations, but it’s still crucial that you do thorough research on your own for cable modem sb6121 that you consider buying. Your questions might include the following:

  • Is it worth buying an cable modem sb6121?
  • What benefits are there with buying an cable modem sb6121?
  • What factors deserve consideration when shopping for an effective cable modem sb6121?
  • Why is it crucial to invest in any cable modem sb6121, much less the best one?
  • Which cable modem sb6121 are good in the current market?
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We’re convinced that you likely have far more questions than just these regarding cable modem sb6121, 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 cable modem sb6121, 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 cable modem sb6121. Make sure that you are only using trustworthy and credible websites and sources.

John Harvards provides an cable modem sb6121 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 cable modem sb6121 currently available on the market.

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  1. Brand Value: Every brand of cable modem sb6121 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 cable modem sb6121?
  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 cable modem sb6121.
  5. Customer Ratings: Number ratings grade cable modem sb6121 objectively.
  6. Customer Reviews: Closely related to ratings, these paragraphs give you first-hand and detailed information from real-world users about their cable modem sb6121.
  7. Product Quality: You don’t always get what you pay for with an cable modem sb6121, sometimes less, and sometimes more.
  8. Product Reliability: How sturdy and durable an cable modem sb6121 is should be an indication of how long it will work out for you.

John Harvards always remembers that maintaining cable modem sb6121 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 cable modem sb6121 is irrelevant, incorrect, misleading, or erroneous, then please let us know promptly!

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FAQ:

Q: What is the best cable modem to buy?

A: Type: Cable Modem for Voice Recommended for: Extreme Pro or below (1000 Mbps) Channel: 32×8 DOCSIS: 3.1 Warranty: 1 year Chosen as: Best Performer

Q: How to connect a cable modem to your computer?

A: Plug one end of the Ethernet cable into the LAN port of the modem. Plug the other end of the Ethernet cable into the computer. Recommended – Turn off the wireless on the computer,so that it switches to the wired connection instead.

Q: What is the best router modem?

A: Motorola MB7420. The Motorola MB7420 is the best cable modem for most homes,capable of supporting speeds available to a majority of home internet plans. Netgear CM500. The Netgear CM500 remains one of the best cable modems available,because it’s easy to find at most retailers; you can also find it for a little … Netgear CM600. …

Q: What is Comcast cable modem?

A: – Three-in-one cable modem saves landline phone costs and recurrent modem rental cost – Broadcom cable modem chipset provides security from denial of service attacks – DOCSIS 3.0 modem offers both Comcast XFINITY internet and voice services – Four gigabit Ethernet LAN ports provide faster wired internet connections