Xfinity (Comcast): can you use your own modem?

Checked against Xfinity (Comcast)'s own policy on 2026-09-28 — Xfinity (Comcast)'s own page. Not paid by Xfinity (Comcast) or any ISP — we track 39 ISPs and 39 named models (how we verify). Amazon links are affiliate.

Own modem allowed — approved list published

Yes — Xfinity (Comcast) allows customer-owned modems and publishes its own approved-device list. It names devices including ARRIS Surfboard S33 and ARRIS Surfboard SBG8300. Buy from that list — anything off it may not activate. Every detail below is quoted from Xfinity (Comcast)'s own page, last checked 2026-09-28.

Connection: cable (DOCSIS)
Verified: 2026-09-28

Browse compatible cable modems for Xfinity on Amazon →

Exact product links open the title-verified model shown; fallback links open an Amazon search. As an Amazon Associate we earn from qualifying purchases, at no extra cost to you. They never change what Xfinity (Comcast) permits: check the model against their own page below before ordering.

Which modems does Xfinity (Comcast) approve?

Xfinity (Comcast) names these models on its own page. They are the exact make and model strings published there as of 2026-09-28 — a sample of the list, not necessarily all of it.

Amazon product/search links · affiliate — we may earn a commission from qualifying purchases, at no extra cost to you.

ARRIS Surfboard S33Exact model matched in Amazon's catalog 2026-09-11.DOCSIS 3.1 · Up to 2.5 GbpsBest for: Gigabit+ plans, future-proof
See price on Amazon →
ARRIS Surfboard SBG8300Exact model matched in Amazon's catalog 2026-09-11.DOCSIS 3.1 · Up to 1 Gbps · Wi-Fi 5 built-inBest for: Plans up to 1 Gbps
See price on Amazon →
ARRIS Surfboard G36Exact model matched in Amazon's catalog 2026-09-11.DOCSIS 3.1 · Wi-Fi 6 built-inAlso named bySparklight
See price on Amazon →
Netgear CBR750Amazon lists this exact model, but no new unit is sold there right now. The button opens a search for it.DOCSIS 3.1 · Wi-Fi 6 built-in
Search this model →
Netgear CAX30Exact model matched in Amazon's catalog 2026-09-11.DOCSIS 3.1 · Wi-Fi 6 built-in
See price on Amazon →
Netgear CAX80Exact model matched in Amazon's catalog 2026-09-11.Up to 2 Gbps · Wi-Fi 6 built-inBest for: Plans up to 1 Gbps
See price on Amazon →
Netgear CM2000Exact model matched in Amazon's catalog 2026-09-11.DOCSIS 3.1 · Up to 2.5 GbpsBest for: Gigabit+ plans, future-proofAlso named byArmstrong Breezeline GCI Sparklight Spectrum
See price on Amazon →
Hitron Technologies CODA56Exact model matched in Amazon's catalog 2026-09-11.DOCSIS 3.1 · Up to 2.5 Gbps · No built-in Wi-Fi (pairs with your own router) · 1 Ethernet portBest for: Gigabit+ plans, future-proof
See price on Amazon →

Browse compatible cable modems for Xfinity on Amazon →

Amazon product/search links · affiliate — we may earn a commission from qualifying purchases, at no extra cost to you.

Check the savings math: Xfinity (Comcast)'s own wording says: "The latest Xfinity Internet plans include the Xfinity Gateway at no extra cost." Xfinity publishes no equipment fee for other plans. Do not buy solely to avoid a modem fee unless Xfinity (Comcast) confirms one applies to your plan; owning can still make sense for hardware choice or control.

Your modemyou buy it, or you rent it
Your ISP's networkthey decide what connects
The internetthe part you actually want

Your equipment has to satisfy Xfinity (Comcast) before it reaches the internet at all — which is why their published rule, not a retailer's compatibility claim, is the one that decides.

Can I use my own modem with Xfinity (Comcast)?

Yes, with a restriction: the device has to appear on Xfinity (Comcast)'s published approved list. In their words: "You can use your own modem, router, or gateway instead of renting equipment from Xfinity. Before you buy a device, make sure it works with Xfinity services and supports your internet speed." FAQ: "Can I use my own modem? Yes. Your modem must work with Xfinity and support your internet speed. Check compatibility at My Device Info before you buy."

Does Xfinity (Comcast) charge an equipment rental fee?

"The latest Xfinity Internet plans include the Xfinity Gateway at no extra cost." Xfinity publishes no equipment fee for other plans.

What DOCSIS version does Xfinity (Comcast) require?

No minimum stated as a requirement. The list's per-device DOCSIS column contains only "DOCSIS 3.0" and "DOCSIS 3.1" values — both appear as compatible.

Do Xfinity (Comcast)'s requirements change with my speed tier?

Each device row states a "Wired Download Speed" cap, e.g. "Up to 2.33 Gbps", "Up to 941 Mbps", "Up to 373 Mbps" — buy to your tier. Policy article FAQ: "Can I use my own device with Gigabit Internet? Yes. Your device must support Gigabit speeds."

Can I use my own equipment with Xfinity (Comcast) phone or voice service?

Permitted. "You can use your own modem, router, or gateway instead of renting equipment from Xfinity." The list has a "Built-in WiFi" Yes/No column and a separate "Voice Telephone enabled" column; gateways (Yes/WiFi) are included, e.g. SBG8300, G36, CBR750. Caveat from the article: "Most modems need a separate router to provide WiFi and work with services like Xfinity Home."

What does Xfinity (Comcast) not allow?

"Devices not shown on this list are either incompatible with the Xfinity network or no longer supported by the device manufacturer." Also: "Can I use Xfinity Prepaid or NOW Internet equipment with Xfinity Internet services? No. Xfinity Prepaid and NOW Internet equipment doesn’t work with Xfinity Internet services." And: "If your device isn't supported, it won’t work with Xfinity."

Two boxes

Modemtalks to the ISP line
Routermakes the Wi-Fi

One box — a “gateway”

Modem + routerone unit does both jobs

Xfinity (Comcast) treats the modem and the Wi-Fi router as separate questions. Read their wording below before assuming one box covers both.

Where does this information come from?

Every statement on this page is quoted from Xfinity (Comcast)'s own published pages:

Last verified 2026-09-28. Approved lists and equipment policies change without notice — re-check the source above before you buy.

Other providers to compare

Other cable providers:Service Electric Shentel Sparklight Spectrum Suddenlink

Compare Xfinity with all 39 providers →