Brian Cryer's Glossary of IT Terms with Links
- MAC address
- Media Access Control address. Hardware serial number that uniquely identifies
a device on a local area network (commonly a
NIC). (Sometimes also referred to as a
A MAC address is 6 bytes in length (i.e. 48 bits) and is normally written as a 12 digit hexadecimal number, with dashes or colons between each pair of hexadecimal digits. The first three bytes identify the manufacturer and the second three bytes represent a unique serial number generated by that manufacturer. MAC addresses should therefore always be unique (although some cards and switches allow the MAC address to be cloned).
To lookup the MAC address of a device on a local network try:
ping device arp -a ip-address
For more information see:
- http://coffer.com/mac_find - Online MAC lookup to identify the manufacturer of the device.
- http://everything.explained.at/MAC_address - MAC Address explained.