This site provides a list of currently approved DOCSIS 3.0 cable modems available for retail purchase. You can use the information provided here to check whether your modem is EOL (End-of-Life) and where to purchase a new one. To ensure that your modem can take advantage of all that XFINITY Internet has to offer and avoid any service interruptions, you will need to replace your current modem with a DOCSIS 3.0 modem.

To view a listing of all currently approved cable modem devices and their compatibility to service level, click here.