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12 December 2005

IEEE OUI & Company ID's

The MAC address is six bytes (48 bits) long, where the first three bytes (OUI) represent the manufacturer of the Network Card. And here is a link from IEEE in order to search for the different OUI's and their equivalent Companies.

One nice trick to know the manufacturer of a certain host is to "ping" it (it has to be in the same subnet with you), and then type "arp -a" to get his MAC address.

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