Best DOCSIS 3.1 cable modems for Xfinity
Researched by Deal.ai's shopping agent across stores on November 14, 2026. Prices below are today's.
Top pick: Netgear Nighthawk CM3000 — a DOCSIS 3.1 modem with a 2.5 Gbps port, so it won't bottleneck Xfinity's fastest tiers, and it's widely sold with plenty of stock. Pair it with your own router.
Who the others suit:
- Netgear CM2500 — same 2.5 Gbps idea, simpler and cheaper; good if you don't need the CM3000's extras.
- ARRIS SURFboard S33 — the classic Xfinity-friendly choice, two Ethernet ports, solid value.
- ARRIS SB8200 — a proven, no-frills DOCSIS 3.1 modem for gigabit plans.
- Hitron CODA56 — budget multi-gig option if you want to spend less.
Check Xfinity's approved-modem list before buying, and skip modem/router combos if you already have a good router.
The picks
- #1
Netgear Nighthawk CM3000 DOCSIS 3.1 Cable Modem
- DOCSIS standard: DOCSIS 3.1
- Download speed: up to 2.5Gbps
- Upload speed: up to 1Gbps
- 2.5G LAN ports: one 2.5Gbps LAN Ethernet port
- Gigabit LAN ports: two 1Gbps LAN Ethernet ports
- Link aggregation: up to 2Gbps
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It checks today's price at every store, compares the alternatives and answers in about a minute.
