Best Modem Xfinity Compatible 400 Mbps in 2025
Updated on June 2025
#1
Recommended
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- Compatible with major cable internet providers; not compatible with Verizon, AT&T, or DSL.
- Coverage of 2,500 sq. ft. and supports 25 devices simultaneously with dual-band WiFi 6.
- 4 Gig Ethernet ports and 1 USB 3.0 port for wired connectivity.
- Functions as both a cable modem and WiFi router, saving on rental fees.
- Supports DOCSIS 3.1 technology for enhanced performance.
- Includes NETGEAR Armor for real-time security protection and easy setup via the Nighthawk app.
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- Compatible with major cable internet providers; not compatible with Verizon, AT&T, or DSL.
- Coverage of 2,500 sq. ft. and supports 25 devices simultaneously with dual-band WiFi 6.
- 4 Gig Ethernet ports and 1 USB 3.0 port for wired connectivity.
- Functions as both a cable modem and WiFi router, saving on rental fees.
- Supports DOCSIS 3.1 technology for enhanced performance.
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#2
Value for Money
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- Reduce cable expenses by owning your modem, potentially saving up to $168 per year on rental fees (varies by provider).
- Utilizes DOCSIS 3.1 technology, delivering speeds up to 10 times faster than DOCSIS 3.0, enhancing security and reducing lag during online gaming.
- Equipped with switchable upstream filters for optimized upload speeds based on your service provider.
- Easy setup: Plug in, download the SURFboard Central App, and follow the activation instructions to connect to a Wi-Fi router.
- Compatible with major U.S. cable providers like Cox, Spectrum, and Xfinity; supports internet plans up to 2.5 Gbps. Confirm compatibility with your ISP.
- Future-proof with DOCSIS 3.1 technology, featuring a 2.5 Gbps Ethernet port and an additional 1 Gbps port for combined speeds up to 3.5 Gbps.
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- Reduce cable expenses by owning your modem, potentially saving up to $168 per year on rental fees (varies by provider).
- Utilizes DOCSIS 3.1 technology, delivering speeds up to 10 times faster than DOCSIS 3.0, enhancing security and reducing lag during online gaming.
- Equipped with switchable upstream filters for optimized upload speeds based on your service provider.
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#3
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- Reliable connectivity with DOCSIS 3.1 technology for faster streaming and downloading.
- Ownership can save up to $168 yearly on cable modem rental fees.
- Supports speeds up to 1 Gbps and offers improved security and reduced lag.
- Easy setup via the SURFboard Central App for quick activation.
- Compatible with major U.S. cable internet providers; verify with your ISP.
- Equipped with two 1-Gigabit ethernet ports for wired connections.
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- Reliable connectivity with DOCSIS 3.1 technology for faster streaming and downloading.
- Ownership can save up to $168 yearly on cable modem rental fees.
- Supports speeds up to 1 Gbps and offers improved security and reduced lag.
- Easy setup via the SURFboard Central App for quick activation.
- Compatible with major U.S. cable internet providers; verify with your ISP.
- Equipped with two 1-Gigabit ethernet ports for wired connections.
#4
25% Off
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- Compatible with major U.S. cable internet providers like Cox, Spectrum, and Xfinity; not compatible with fiber optic, DSL, or satellite services.
- Excludes Wi-Fi capabilities and does not support digital voice services.
- Approved for cable internet speeds up to 1 Gbps; verify compatibility with your specific ISP.
- Features 32 downstream and 8 upstream DOCSIS 3.0 bonded channels, or 2 downstream and 2 upstream OFDM DOCSIS 3.1 channels.
- Equipped with two 1-Gigabit Ethernet ports.
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- Compatible with major U.S. cable internet providers like Cox, Spectrum, and Xfinity; not compatible with fiber optic, DSL, or satellite services.
- Excludes Wi-Fi capabilities and does not support digital voice services.
- Approved for cable internet speeds up to 1 Gbps; verify compatibility with your specific ISP.
- Features 32 downstream and 8 upstream DOCSIS 3.0 bonded channels, or 2 downstream and 2 upstream OFDM DOCSIS 3.1 channels.
- Equipped with two 1-Gigabit Ethernet ports.
#5
68% Off
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- Compatible with major cable internet providers such as Xfinity, COX, and Spectrum.
- Saves up to $168 annually by eliminating rental fees for the modem.
- Supports speeds up to 800Mbps for Xfinity, 500Mbps for COX, and 400Mbps for Spectrum.
- Connects seamlessly with any Wi-Fi router through its Ethernet port.
- Features one Gigabit Ethernet port for direct connections.
- Utilizes advanced DOCSIS 3.1 technology for reliable performance.
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- Compatible with major cable internet providers such as Xfinity, COX, and Spectrum.
- Saves up to $168 annually by eliminating rental fees for the modem.
- Supports speeds up to 800Mbps for Xfinity, 500Mbps for COX, and 400Mbps for Spectrum.
- Connects seamlessly with any Wi-Fi router through its Ethernet port.
- Features one Gigabit Ethernet port for direct connections.
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#6
31% Off
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- Own your modem to eliminate rental fees, saving up to $168 annually on your cable bill.
- Utilizes DOCSIS 3.1 technology, offering speeds 10x faster than DOCSIS 3.0 and improved security for gaming and multi-gig networks.
- Easy setup with the SURFboard Central App; plug in, download the app, and follow activation instructions.
- Compatible with Xfinity Internet & Voice, supporting cable internet plans up to 800 Mbps.
- Designed for high-speed performance with features suitable for fiber optic gaming and voice services.
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- Own your modem to eliminate rental fees, saving up to $168 annually on your cable bill.
- Utilizes DOCSIS 3.1 technology, offering speeds 10x faster than DOCSIS 3.0 and improved security for gaming and multi-gig networks.
- Easy setup with the SURFboard Central App; plug in, download the app, and follow activation instructions.
- Compatible with Xfinity Internet & Voice, supporting cable internet plans up to 800 Mbps.
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#7
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- Compatible with major cable internet providers, offering speeds up to 2Gbps; certified with Spectrum, Cox, and Xfinity.
- Covers up to 2,500 sq. ft. and supports 25 devices with WiFi 6 speeds up to 2.7Gbps.
- Includes 4 Gig Ethernet ports and a USB 3.0 port for wired connections.
- Easy setup and management through the Nighthawk app for speed tests and data monitoring.
- Combines cable modem and WiFi router functions, potentially saving users up to $168 annually.
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- Compatible with major cable internet providers, offering speeds up to 2Gbps; certified with Spectrum, Cox, and Xfinity.
- Covers up to 2,500 sq. ft. and supports 25 devices with WiFi 6 speeds up to 2.7Gbps.
- Includes 4 Gig Ethernet ports and a USB 3.0 port for wired connections.
- Easy setup and management through the Nighthawk app for speed tests and data monitoring.
- Combines cable modem and WiFi router functions, potentially saving users up to $168 annually.
#8
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- 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.
- MODEM TECHNOLOGY: Engineered with 8x4 channel bonding and DOCSIS 3.0.
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- 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.
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#9
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- Compatible with major cable internet providers such as Xfinity, COX, and Spectrum; not compatible with DSL, Verizon, or AT&T.
- Eliminates monthly rental fees by replacing equipment, potentially saving up to $168 annually.
- Optimized for cable internet plans offering speeds up to 400 Mbps.
- Easily connects to any WiFi router via Ethernet for comprehensive wireless coverage.
- Features 1 Gigabit Ethernet port for direct connections to computers or other routers.
- Utilizes advanced 24x8 channel bonding and DOCSIS 3.0 technology.
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- Compatible with major cable internet providers such as Xfinity, COX, and Spectrum; not compatible with DSL, Verizon, or AT&T.
- Eliminates monthly rental fees by replacing equipment, potentially saving up to $168 annually.
- Optimized for cable internet plans offering speeds up to 400 Mbps.
- Easily connects to any WiFi router via Ethernet for comprehensive wireless coverage.
- Features 1 Gigabit Ethernet port for direct connections to computers or other routers.
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#10
24% Off
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- Compatible with major cable internet providers, supporting speeds up to 2Gbps. Not compatible with DSL and bundled voice services.
- Connects to any WiFi router via Ethernet to support all wireless devices.
- Eliminates rental fees, saving up to $168 per year by replacing rental modems.
- Four Gigabit Ethernet ports for fast wired connections to devices.
- Utilizes advanced modem technology, including DOCSIS 3.1 and 32x8 channel bonding.
- Designed for use in the United States only.
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- Compatible with major cable internet providers, supporting speeds up to 2Gbps. Not compatible with DSL and bundled voice services.
- Connects to any WiFi router via Ethernet to support all wireless devices.
- Eliminates rental fees, saving up to $168 per year by replacing rental modems.
- Four Gigabit Ethernet ports for fast wired connections to devices.
- Utilizes advanced modem technology, including DOCSIS 3.1 and 32x8 channel bonding.
Read More
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