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Each cable modem, regardless of brand, is uniquely identified by its Cable Modem ID, or MAC address - short for Media Access Control. This address is a part of the hardware on the modem, and is associated with a specific user account.
As there are numerous cable modems on the market, and nearly as many that are used by our customers, below are generic instructions to locate your MAC address:
If you can access the modem settings page at »192.168.100.1 the MAC Address usually is also displayed on one of the pages. Not all modems and not all ISPs/divisions allow access to this page, so YMMV.