If you pay for multi-gig cable service, the modem you choose can make or break your speeds. A good cable modem for 2.5Gbps internet should support DOCSIS 3.1, offer a true 2.5Gbps Ethernet port, and work reliably with your provider.
Below, we’ve narrowed the field to 10 strong options that are built for high-speed cable plans, router pairing, and long-term value.
Best 10 Cable Modem for 2.5Gbps Internet Picks for 2026
Top Pick
Motorola MB8611 DOCSIS 3.1 Multi-Gig Modem
- 2.5Gb Ethernet port for multi-gig service
- Approved for Xfinity, Cox, and Spectrum
- DOCSIS 3.1 with low-latency AQM
Best For: Shoppers who want a straightforward 2.5Gbps-ready modem with broad ISP support.
Runner-Up
ARRIS SURFboard S33 Renewed Multi-Gig Modem
- 2.5Gbps port plus extra 1Gbps Ethernet
- DOCSIS 3.1 for plans up to 2.5Gbps
- Renewed option with 90-day warranty
Best For: Value-focused shoppers who want multi-gig speed and dual Ethernet ports.
Fastest Uploads
NETGEAR Nighthawk CM3000 Mid/High-Split Modem
- Mid/high-split support for faster uploads
- 2.5Gb port plus two Gigabit ports
- Works with Xfinity, Spectrum, and Cox
Best For: People on advanced cable plans who want stronger upload speeds and future-ready hardware.
Best Compact Design
ARRIS Surfboard S33 DOCSIS 3.1 Modem
- Supports cable plans up to 2.5Gbps
- Compact design with simple LEDs
- Compatible with Xfinity, Spectrum, and Cox
Best For: Shoppers who want a small, easy-to-set-up 2.5Gbps-ready modem.
Mid/High-Split Performance Pick
- Up to 2.5Gbps download and 1Gbps upload support
- 2.5GbE port for multi-gig router connections
- Built for newer mid/high-split cable networks
Best For: Fast cable plans with stronger upload needs
Modem-Only Budget Multigig Option
- Supports up to 2.5Gbps with a 2.5GbE port
- DOCSIS 3.1 modem only; router required
- Compatible with Xfinity, Spectrum, and Cox
Best For: Cable users who already have a router
Renewed Value Multi-Gig Choice
- 2.5Gbps max speed with 1G and 2.5G ports
- Approved for Cox, Spectrum, Xfinity, and more
- App-guided setup through SURFboard Central
Best For: Renewed multi-gig buyers who want flexibility
Renewed Compact Pick
Motorola B12 2.5Gbps DOCSIS 3.1 Modem
- Up to 2500 Mbps DOCSIS 3.1 support
- 2.5 Gbps port for fast router connections
- Works with Xfinity, Cox, and Spectrum
Best For: A compact renewed modem for multi-gig cable plans
Dual-Port Upgrade
ARRIS S33 Multi-Gig Cable Modem
- Supports plans up to 2.5 Gbps
- Has 2.5 Gb and 1 Gb Ethernet ports
- Works with major cable providers
Best For: Users who want a modem-only setup with extra wired flexibility
Value Multi-Gig Choice
Hitron CODA56 2.5Gbps Cable Modem
- Supports speeds up to 2.5 Gbps
- 2.5 Gbps Ethernet port for router setups
- Certified for Xfinity, Spectrum, and Cox
Best For: Cable internet users with their own Wi‑Fi router
Top Pick – Motorola MB8611 DOCSIS 3.1 Multi-Gig Modem
If you want a cable modem for 2.5Gbps internet, the Motorola MB8611 is built for exactly that job. It pairs with your own Wi‑Fi router, supports DOCSIS 3.1 multi-gig service, and adds a 2.5Gb Ethernet port for connecting to high-speed routers or computers.
Best For: Buyers who want a simple, high-speed modem with strong compatibility and a 2.5GbE port.
Pros:
- 2.5Gb Ethernet port supports multi-gig connections
- Approved for Comcast Xfinity, Cox Gigablast, and Spectrum
- DOCSIS 3.1 with backward compatibility to 32×8 DOCSIS 3.0
- Includes Active Queue Management for lower latency in gaming and conferencing
Cons:
- No built-in Wi‑Fi router
- No telephone/cable voice support
- Only one Ethernet port
This is a solid pick if you want a dependable modem that supports fast internet plans without extra features you may not need. The 2-year warranty and USA technician support add peace of mind.
Runner-Up – ARRIS SURFboard S33 Renewed Multi-Gig Modem
ARRIS - SURFboard S33 32 x 8 DOCSIS 3.1 Multi-Gig Cable Modem with 2.5 Gbps (Renewed)
Check Price On AmazonThe renewed ARRIS SURFboard S33 is another cable modem for 2.5Gbps internet, with a 2.5Gbps Ethernet port and an extra 1Gbps port for a second network connection. It works with your existing Wi‑Fi router and is approved for major cable providers like Xfinity, Spectrum, and Cox.
Best For: Buyers who want multi-gig performance and a second Ethernet port at a renewed price point.
Pros:
- 2.5Gbps Ethernet port plus a second 1Gbps port
- DOCSIS 3.1 modem approved for up to 2.5Gbps plans
- Compatible with major U.S. cable providers
- Works with an existing Wi‑Fi router
Cons:
- Renewed unit comes with a 90-day limited warranty
- No Wi‑Fi built in
- No cable voice support
If you want a flexible multi-port modem and are comfortable buying renewed hardware, the S33 delivers the right core specs for fast cable service. Just confirm your provider and plan before ordering.
Fastest Uploads – NETGEAR Nighthawk CM3000 Mid/High-Split Modem
The NETGEAR Nighthawk CM3000 is a cable modem for 2.5Gbps internet that goes beyond standard multi-gig service with mid/high-split support. It is designed for today’s fastest DOCSIS 3.1 cable plans and includes a 2.5Gb port plus two Gigabit ports for flexible high-speed networking.
Best For: Users on the fastest cable tiers who want better upload performance and future-proof hardware.
Pros:
- Mid/high-split DOCSIS 3.1 support for faster uploads
- 2.5Gb port for multi-gig router connections
- Two Gigabit ports can be used with link aggregation
- Works with major U.S. providers including Xfinity, Spectrum, and Cox
Cons:
- No built-in Wi‑Fi
- Separate Wi‑Fi router required
- Made for use in the U.S. only
This model makes the most sense if your internet plan supports higher upload speeds and you want hardware ready for newer cable-network upgrades. Pair it with a strong Wi‑Fi 6E or Wi‑Fi 7 router for the best results.
Best Compact Design – ARRIS Surfboard S33 DOCSIS 3.1 Modem
If you need a cable modem for 2.5Gbps internet and want something smaller on the shelf, the ARRIS Surfboard S33 is a clean, compact option. It supports cable plans up to 2.5Gbps and connects to a separate Wi‑Fi router for whole-home coverage.
Best For: Buyers who want a compact DOCSIS 3.1 modem with straightforward setup.
Pros:
- Supports cable plans up to 2.5Gbps
- Compact footprint with simple status LEDs
- Easy setup with a separate Wi‑Fi router
- Compatible with major cable providers like Xfinity, Spectrum, and Cox
Cons:
- No built-in Wi‑Fi
- Requires a separate router or mesh system
- Model details list a 2-year warranty, but still confirm retailer coverage
The S33 is a practical choice if you want a no-frills modem that keeps the setup simple while still handling multi-gig cable service. It is especially appealing for smaller spaces where a compact modem matters.
Mid/High-Split Performance Pick – NETGEAR Nighthawk CM3000
If you want a cable modem for 2.5Gbps internet that is built for newer DOCSIS 3.1 speed tiers, the NETGEAR Nighthawk CM3000 is aimed at exactly that use case. It supports today’s faster mid/high-split cable networks and is designed for multi-gig service from major US providers.
Best For: Users on fast cable plans who want strong upload performance and a modem ready for multi-gig networking.
Pros:
- Supports up to 2.5Gbps download speeds and 1Gbps upload speeds
- Built for mid/high-split DOCSIS 3.1 internet, including faster upload-focused plans
- Includes a 2.5GbE port for direct multi-gig router connections
- Works with major US providers like Xfinity, Spectrum, and Cox
Cons:
- Made for use in the US only
- Does not include Wi-Fi, so you still need a separate router
Overall, this is the most future-focused option here if your plan is built around newer cable network capabilities. It makes the most sense for buyers who care about both download speed and stronger upload performance.
Modem-Only Budget Multigig Option – Hitron CODA56
The Hitron CODA56 is a straightforward cable modem for 2.5Gbps internet if you already have a separate Wi-Fi router. It is a DOCSIS 3.1 modem only, so it keeps the focus on wired cable performance without adding extra wireless features.
Best For: Buyers who want a modem-only setup for cable service and already own a capable router.
Pros:
- Supports plans up to 2.5Gbps with a 2.5Gbps Ethernet port
- Compatible with cable providers like Xfinity, Spectrum, and Cox
- DOCSIS 3.1 design supports low-latency gaming, streaming, and video calls
- May help reduce modem rental fees
Cons:
- No Wi-Fi included, so a separate router is required
- Will not work with fiber, DSL, satellite, or fixed wireless internet
- Requires cable internet service and ISP activation
If you already own the router and just need a fast modem, this is a practical no-frills pick. It fits best with cable users who want multigig support without paying for extras they do not need.
Renewed Value Multi-Gig Choice – ARRIS S33-RB Renewed
The ARRIS S33-RB is a renewed cable modem for 2.5Gbps internet that emphasizes simple setup and broad cable compatibility. It is DOCSIS 3.1-based, has 1G and 2.5G ports, and is designed to work with major US cable providers.
Best For: Shoppers who want a renewed multi-gig modem from a known cable-modem brand.
Pros:
- Supports 2.5Gbps max internet speeds
- Includes both 1Gb and 2.5Gb ports for flexible wired setups
- Approved for Cox, Spectrum, Xfinity, and other US cable providers
- Simple activation through the SURFboard Central app
Cons:
- Does not include Wi-Fi
- Does not support cable digital voice service
- Renewed product, not brand new
This is a solid pick if you want multi-gig capability and are comfortable buying renewed hardware. It is especially useful for cable customers who want a basic, app-guided setup and do not need voice support.
Renewed Compact Pick – Motorola B12 2.5Gbps DOCSIS 3.1 Modem
If you want a cable modem for 2.5Gbps internet without paying for extra features you may not use, the Motorola B12 is a straightforward DOCSIS 3.1 option. It supports up to 2500 Mbps and includes a 2.5 Gbps port, so it can pair with a compatible router for high-speed cable plans from Comcast Xfinity, Cox, and Spectrum.
Best For: Buyers who want a compact renewed modem for fast cable internet and already have a Wi‑Fi router.
Pros:
- Supports up to 2500 Mbps with DOCSIS 3.1.
- Includes a 2.5 Gbps Ethernet port for high-speed router hookups.
- Compatible with Comcast Xfinity, Cox, and Spectrum.
- Compact design with a 90-day limited warranty.
Cons:
- Renewed unit, not brand-new.
- Modem-only design requires a separate Wi‑Fi router.
- Only one Ethernet port is listed.
Overall, this is a practical pick if you want multi-gig cable performance in a compact modem and are comfortable with a renewed device. The main value is its 2.5 Gbps port and broad support for major cable providers.
Dual-Port Upgrade – ARRIS S33 Multi-Gig Cable Modem
The ARRIS SURFboard S33 is a cable modem for 2.5Gbps internet built for users who want multi-gig support plus a little extra flexibility. It supports cable plans up to 2.5 Gbps, includes both 2.5 Gb and 1 Gb Ethernet ports, and is designed to work with major providers like Xfinity, Cox, and Spectrum.
Best For: Anyone who wants a modem-only setup with a 2.5Gbps port and an extra wired Ethernet option.
Pros:
- Supports cable internet plans up to 2.5 Gbps.
- Includes both 2.5 Gigabit and 1 Gigabit Ethernet ports.
- Compact design with simple status LEDs.
- Compatible with Xfinity, Cox, and Spectrum.
Cons:
- Modem only, so you still need a separate Wi‑Fi router.
- Not compatible with fiber, DSL, or satellite service.
- Provider/model approval still needs to be confirmed.
For shoppers comparing multi-gig cable modems, the S33 stands out for its dual Ethernet layout and straightforward setup. It is a strong choice if you want to connect a high-speed router and keep one extra wired port available.
Value Multi-Gig Choice – Hitron CODA56 2.5Gbps Cable Modem
The Hitron CODA56 is a cable modem for 2.5Gbps internet aimed at people who already plan to use a separate router. It supports speeds up to 2.5 Gbps through a 2.5 Gbps Ethernet port, works with cable service from Xfinity, Spectrum, and Cox, and is built for DOCSIS 3.1 performance with low-latency use cases like streaming and gaming.
Best For: Buyers with cable internet and a separate Wi‑Fi router who want a simple multi-gig modem.
Pros:
- Supports internet plans up to 2.5 Gbps.
- Includes a 2.5 Gbps Ethernet port.
- DOCSIS 3.1 design for cable, gaming, and streaming.
- Compatible with Xfinity, Spectrum, and Cox.
Cons:
- Modem only, with no built-in Wi‑Fi.
- Requires a separate router for wireless use.
- Only cable internet is supported, not fiber or DSL.
In a 2.5Gbps cable modem roundup, the CODA56 makes sense if you want focused performance and already have networking gear in place. Its main appeal is the combination of multi-gig support, ISP certification, and a straightforward modem-only design.
How We Picked the Best Cable Modem for 2.5Gbps Internet
We focused on modems that are designed for modern multi-gig cable plans, with an emphasis on DOCSIS 3.1 support, a 2.5Gbps Ethernet port, and wide compatibility with major providers such as Xfinity, Spectrum, and Cox. We also considered whether each Cable Modem for 2.5Gbps Internet is a practical buy for typical home setups, including router-only use, easy activation, and overall future-proofing.
Quick Comparison
When comparing options, the biggest differences usually come down to port speed, certification, and split readiness. Some models are straightforward 2.5Gbps cable modems built for standard high-speed tiers, while others are mid/high-split ready for newer network upgrades. If you already own a strong router, choose a modem-only model that can feed it at full speed. If you want the simplest setup, prioritize proven compatibility with your ISP.
Key Buying Factors for a Cable Modem for 2.5Gbps Internet
DOCSIS 3.1 and Multi-Gig Support
DOCSIS 3.1 is the baseline for fast cable service. For 2.5Gbps plans, make sure the modem includes a 2.5Gbps LAN port rather than a standard gigabit port, or you will bottleneck your connection.
Provider Approval
Compatibility matters as much as speed. Check whether the modem is approved for your provider and your specific speed tier. Even strong hardware can be a poor choice if it is not officially supported.
Router Pairing
Most buyers will use a separate WiFi router. In that case, the modem should deliver multi-gig speed cleanly to your router, especially if your router also has a 2.5GbE WAN port.
Mid/High-Split Readiness
Some newer cable networks use mid/high-split upgrades to improve upstream performance. If your provider is rolling out these changes, a modem built for those conditions can be a smarter long-term purchase.
Who Should Buy Which Cable Modem for 2.5Gbps Internet?
If you want a simple, proven setup, pick a widely approved DOCSIS 3.1 modem with a 2.5Gbps port. If you already have a high-end router and want the best wired throughput, choose a model that clearly supports full multi-gig handoff. If your ISP is upgrading its network, a mid/high-split-ready modem may be the safest future-proof choice. For most households, the best Cable Modem for 2.5Gbps Internet is the one that matches your provider, router, and speed plan without unnecessary extras.