Is there a special numbering scheme for MAC addresses?
The MAC addresses are exactly 6 bytes in length, and are usually written in hexadecimal as 12:34:56:78:90:AB (the colons may be omitted, but generally make the address more readable). Each manufacturer of Ethernet devices applies for a certain range of MAC addresses they can use. The first three bytes of the address determine the manufacturer. RFC-1700 (available via FTP) lists some of the manufacturer-assigned MAC addresses. A more up-to-date listing of vendor MAC address assignments is available on ftp.lcs.mit.edu in pub/map/Ethernet-codes.
