Cable modem compatibility checklist illustration — Review compatibility basics and buying checkpoints before choosing a modem.

Independent compatibility guide

How to verify an Xfinity-compatible modem.

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Check the live approved-device information

Compatibility changes with service tiers, network upgrades, and equipment support. Verify the exact modem model against Xfinity’s current approved-device information before purchase.

Cable modem connected to a home router — A compatible modem still needs the right router and local network to deliver a good experience.

Match the Ethernet handoff

For plans above gigabit, make sure the modem and router both have suitable multi-gigabit interfaces.

Voice service

If the account includes voice, verify telephony requirements before choosing a data-only modem.