Modem × ISP
Modems the ISP says are approved
We record a modem only when an ISP's own list shows it. Lists we could not retrieve are marked below; nothing is filled in from memory or retailer pages.
Xfinity (Comcast) Partial list
Six modems shown on the public page without signing in; the full list is address-gated ('See all modems'), so this is not the complete list.
Source: xfinity.com · read October 26, 2026
| Modem | Wired down | Wired up | Built-in Wi-Fi | Voice |
|---|---|---|---|---|
| Netgear CM2050V | Up to 2.32 Gbps | Up to 485 Mbps | No | Yes |
| Netgear CM2500 | Up to 936 Mbps | Up to 456 Mbps | No | No |
| Netgear CM3000 | Up to 2.33 Gbps | Up to 486 Mbps | No | No |
| Hitron CODA56 | Up to 2.33 Gbps | Up to 455 Mbps | No | No |
| ARRIS S34 | Up to 2.32 Gbps | Up to 444 Mbps | No | No |
| Ubiquiti UCI | Up to 2.33 Gbps | Up to 474 Mbps | No | No |
Speeds are the maximums Xfinity shows on each card. Xfinity decides compatibility for your address and plan, so use its address lookup before buying.
Spectrum (Charter) Not retrieved yet
Spectrum's policy page says recommended and minimally qualified modem lists are at spectrum.net/modems; our tools could not load the list.
Source: spectrum.net · read October 26, 2026
Cox Not retrieved yet
Page blocked or empty for our tools; not retrieved.
Source: cox.com · read October 26, 2026
Spectrum's rule
Spectrum's DOCSIS Modem Policy says subscribers must use an authorized modem, that it recommends devices passing its full performance certification, and that "minimally qualified" modems are permitted but not recommended. It points to spectrum.net/modems for both lists. Read the policy (read October 26, 2026).
Claims circulating that Spectrum will retire DOCSIS 3.0 modems on a specific date are unverified: the policy page we read says nothing about it, and we have not found a Spectrum source. We do not state it as fact.