Comcast/XFINITY approved cable modems include the Arris CM820A Touchstone cable modem, the Arris/Motorolla SB6126 Surfboard cable modem and the Belkin DPC3008 cable Modem. Since modem needs vary, interested parties should consult a full listing on the Comcast/XFINITY website.
Approved modems are listed in a selection table on the DOCSIS Device Information Center of the XFINITY website. Filter options on this table allow the customer to sort out End-of-Life devices, select for retail only models, and look for either DOCSIS 2.0 or DOCSIS 3.0 devices. Approved items can be purchased from Amazon.com via a portal on the site.
Other websites, such as Approved Modems and the Wirecutter, offer both modem listings and reviews of products on the approved list. This helps the consumer in selecting a modem, as the list indicates many options. Both sites recommend models by Arris/Motorolla over the other devices available. The Arris/Motorolla Surfboard 6141is the most popular and well-reviewed cable modem in its class, says the Wirecutter.
For XFINITY voice customers, it is important to make sure that the approved device is also of the correct type. Only modems with the type eMTA can be used. This information is found in the details of the device when it is selected from the list.