Xfinity Compatible Modems 2026: Which Model is Best for Your Plan

Paying for a fast Xfinity plan doesn’t always mean you’re getting its full speed. The modem you use matters, especially as Xfinity Internet continues upgrading its network for faster download and upload performance.

In 2026, Xfinity-compatible modems are generally DOCSIS 3.1 or newer. According to CableLabs, DOCSIS 3.1 increased existing HFC network capacity by more than 50%, supporting faster broadband and growing data demands. Older or unsupported modems may still connect but can limit your plan’s available speeds.

If you’re planning to buy your own modem instead of paying a monthly equipment rental fee, compatibility should be your first check. Look for a model that appears on Xfinity’s approved device list and supports the speed tier you’re paying for.

Some commonly supported brands include Hitron, NETGEAR, and ARRIS/Surfboard, but compatibility should still be checked for your specific Xfinity plan and location.

For a quick overview, here are the Xfinity-compatible modems covered in this guide:

• Hitron CODA56 – Suitable for most users and multi-gig plans
• NETGEAR Nighthawk CM3000 – Suitable for multi-gig plans and enhanced speeds
• ARRIS SURFboard S33 – An option for standard Xfinity speeds
• Hitron CODA – A budget-friendly option for plans up to 1 Gbps
• ARRIS SURFboard SB8200 – An older option for supported lower-speed plans

Each modem has different speed, hardware, and compatibility considerations, so below I’ve explained where each model fits and what to check before choosing one.

Some commonly supported brands include Hitron, NETGEAR, and ARRIS/Surfboard, but compatibility should still be checked for your specific Xfinity plan and location.

1. Hitron CODA56 – Best for Most Users

The Hitron CODA56 is a DOCSIS 3.1 modem certified for Comcast Xfinity. It supports internet speeds up to 2.5 Gbps, upload capability up to 1 Gbps, and includes a 2.5 Gigabit Ethernet port.

• Best for: Users who want a straightforward multi-gig Xfinity-compatible modem
• Key feature: 2.5GbE port for plans above standard Gigabit speeds
• Keep in mind: You’ll need a separate Wi-Fi router

2. NETGEAR Nighthawk CM3000 – Best for Multi-Gig Plans

The NETGEAR Nighthawk CM3000 is another DOCSIS 3.1 option designed for mid/high-split cable networks. NETGEAR currently lists support for Xfinity speeds up to 2 Gbps download and 200 Mbps upload, along with a 2.5GbE port.

• Best for: Multi-gig users, larger households, gaming, and heavy streaming
• Key feature: Mid/high-split support with multi-gig Ethernet
• Keep in mind: It does not support Xfinity Voice service

3. ARRIS SURFboard S33 – Best for Standard Xfinity Speeds

The ARRIS SURFboard S33 can still work as a DOCSIS 3.1 modem for compatible Xfinity plans, but I wouldn’t recommend it to readers specifically looking for Xfinity’s enhanced upload speeds.

For that use case, the newer SURFboard S34 is the more relevant model on Xfinity’s enhanced-speed device lists. For Gigabit plans, users seeking Xfinity’s enhanced Next Gen upload speeds should verify current certification status before purchasing.

You don’t need to spend extra on a multi-gig modem if your Xfinity plan can’t take advantage of it. For lower- or mid-range speed tiers, an affordable DOCSIS 3.1 modem may be enough.

1. Hitron CODA (Basic Model) – Best Budget Pick for Up to Gigabit Plans

The Hitron CODA is a DOCSIS 3.1 modem certified for Xfinity and designed for internet plans up to 1 Gbps. It includes Gigabit Ethernet connectivity and works with a separate Wi-Fi router or mesh system.

• Best for: Xfinity users with plans up to 1 Gbps
• Key feature: DOCSIS 3.1 support without paying for multi-gig hardware
• Keep in mind: For enhanced upload speeds, check Xfinity’s current certified-device list before buying.

2. ARRIS SURFboard SB8200 – Best for Lower-Speed Legacy Plans

The ARRIS SURFboard SB8200 is an older DOCSIS 3.1 option that can still work with compatible Xfinity tiers. However, it isn’t a good choice if you want Gigabit-plus or enhanced upload speeds.

Xfinity currently rates versions of the SB8200 below 1 Gbps wired download and does not list it for enhanced uploads.

• Best for: Lower-speed plans where the SB8200 is still supported
• Key feature: DOCSIS 3.1 without paying for newer multi-gig hardware
• Keep in mind: Check your exact plan compatibility before purchasing.

The right modem should match the speeds and network features available with your Xfinity plan. A higher advertised maximum speed doesn’t automatically make a modem the better choice.

Before buying, check these factors:

• Xfinity compatibility: Confirm the exact model through Xfinity’s My Device Info.
• DOCSIS standard: DOCSIS 3.1 is widely used for current Xfinity plans, but the DOCSIS version alone doesn’t guarantee full Xfinity speed support.
• Plan speed: Make sure the modem is approved for your download and upload speed tier. An underpowered modem can limit performance, while connection or activation problems may also leave your Xfinity router blinking orange instead of establishing a normal connection.
• Enhanced upload support: If Xfinity has upgraded its network in your area, check whether the modem supports the enhanced speeds available at your address.
• Ethernet port: For plans above 1 Gbps, a 2.5GbE or faster port helps prevent the modem’s wired connection from becoming a bottleneck.
• Future upgrades: If you expect to move to a faster plan soon, consider a modem with enough capacity for that upgrade.

Activation and Setup

Once your compatible modem is connected to the coaxial cable and powered on, you can activate it through the Xfinity app by following the on-screen instructions.

During startup, pay attention to the Gateway’s status light, as an Xfinity router blinking white can indicate that the device is still going through its connection or activation process.

A modem may be technically compatible with Xfinity but still be a poor choice for your plan. Before buying, watch out for older hardware, account-locked devices, and models that cannot support the speeds available at your address.

1. DOCSIS 3.0 Modems

Avoid them because:

• Limited support for multi-gig plans
• Slower upload performance
• Limited network capacity: Older DOCSIS standards offer less capacity and efficiency than newer generations designed for faster cable broadband.
• More likely to be phased out as network upgrades continue

2. Unsupported Legacy Modems

Xfinity notes that older equipment may eventually become incompatible as network technology, speeds, and security requirements change.

• May not qualify for enhanced upload speeds
• Potential compatibility issues after network upgrades
• Reduced long-term support

3. Used Modems Still Linked to Another Account

Avoid them because:

• Activation may be blocked
• Ownership verification can be difficult
• Customer support may have limited options until the device is released from the previous account

4. Refurbished Modems Without an Activation Guarantee

Some refurbished modems have hidden hardware issues or may not be eligible for activation. Avoid them because:

• Greater risk of receiving outdated hardware
• No guarantee that the modem can be activated
• Limited or no warranty coverage