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MAC Address Lookup
Identify the manufacturer/vendor of a network device from its MAC address.
Accepted Formats
00:1A:2B:3C:4D:5EColon-separated00-1A-2B-3C-4D-5EDash-separated001A.2B3C.4D5ECisco format001A2B3C4D5ENo separatorAbout MAC Addresses
OUI (Vendor Prefix)
First 3 bytes (24 bits) identify the manufacturer. Assigned by IEEE.
Device Identifier
Last 3 bytes (24 bits) are assigned by the manufacturer to each device.
Unicast vs Multicast
Least significant bit of first byte: 0 = unicast, 1 = multicast.
UAA vs LAA
Second least significant bit: 0 = universally administered, 1 = locally administered.