Mac Address Assignments

Mac Address Assignments-38
The leftmost 6 digits (24 bits) called a "prefix" is associated with the adapter manufacturer (M).Each vendor registers and obtains MAC prefixes as assigned by the IEEE.

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Among all devices manufactured with the same vendor prefix, each is given their own unique 24-bit number.

Vendors often possess many prefix numbers associated with their different products.

For example, the prefixes , :9C and 68:7F:74 (plus many others) all belong to Linksys (Cisco Systems).

Some Internet Service Providers link each of their residential customer accounts to the MAC addresses of the home network router (or another gateway device).

The address seen by the provider doesn't change until the customer replaces their gateway, such as by installing a new router.

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