Xfinity approved modems, and which one fits your plan
Xfinity keeps a published device list and checks every modem against it at activation. During 2026 it removed every remaining DOCSIS 3.0 model, so a 3.1 modem is now the only purchase that will provision.
Compiled from Comcast's device list, checked September 2026 · Xfinity's device list
What we'd buy for Xfinity
Prices move weekly, so we link out rather than print a figure that will be wrong when you read it.
Fast enough for any plan sold today and approved across the major cable networks. The default answer.
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The one to buy on a gigabit plan or above. No built-in Wi-Fi, so the radio cannot age before the modem does.
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Cheaper, and nothing wasted if your plan tops out near 500 Mbps.
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Home phone needs a voice-capable modem — a data-only model will not carry the line.
Check price →Every model, by brand
ARRIS / SURFboard 4 models
NETGEAR 4 models
Motorola 3 models
Hitron 1 model
Ubiquiti 1 model
Xfinity modems: questions worth answering
Why won't my old DOCSIS 3.0 modem activate on Xfinity?
Comcast removed its remaining DOCSIS 3.0 models in two waves during 2026 — a large batch in April and the last few in July. Devices that came off the list stop provisioning, even if they worked the week before.
Do I need a voice modem for Xfinity Voice?
Yes. Home phone service will not run through a standard data modem regardless of its speed rating. Three retail voice models are approved, including the NETGEAR CM2050V.
Will a 2.5 GbE modem help on a sub-gigabit plan?
Not today, but it costs little more than a 1 GbE model and removes the need to buy again when you upgrade.
Some links earn a commission if you buy, at no cost to you. It never changes which modems appear or how they are ordered. Device lists come from Xfinity's own pages and change without notice — check before purchasing.