<networking> (Or "MAC address") The physical address identifying an individual Ethernet controller board.
An Ethernet addess is a 48-bit number aabbccddeeff where a-f are hexadecimal digits.
The first 24 bits, aabbcc, identify the manufacturer of the controller.
The Ethernet address is hard-wired on some controllers, stored in a ROM on some, and others allow it to be changed from software.
It is usually written as six hexadecimal numbers, e.g. 08:00:20:03:72:DC.
See also ARP, Internet address.
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Address Resolution Protocol