Ethernet MAC Address / OUI / Fibre Channel WWN / Vendor Lookup

Search by Ethernet MAC address, OUI, or Bluetooth device address: Enter complete MAC address or at least first six characters including all leading zeros. For example: 00-16-68 or 00-16-68-2B-40-90 or 00:16:68:2B:40:90 or 0016682B4090 or 00.16.68.2B.40.90. For multiple MAC addresses use our Bulk MAC Address Lookup tool.

Search by Fibre Channel WWN address: Enter complete WWN address including all leading zeros. For example: 210000e08b02e345 or 10:00:00:60:69:00:23:74 or 10.00.00.60.69.00.23.74. Search by NAA 6 128-bit WWN is also supported. NAA 6 WWNs are used as LUN or disk identifiers. For example: naa.600a098038303466302776626358764d, /dev/dsk/c6t60020F200000CA933D7719CA00088BB5d0s0 (WWN is highlighted). For bulk WWN lookup use this tool.

Search by vendor: Enter at least three alpha-numeric characters to match any part of vendor’s name. For example: IBM or Cisco. One- and two-character search strings are also accepted and will match only a whole part of vendor’s name. For example: a search for AT will bring At Work Computers, AT&T and so on; a search for L will bring L.S.I. Japan Co., Ltd. and L-3 Communication Aviation Recorders, etc.

Database last updated: Apr 1, 2024. Primary source - IEEE Standards Association

A Media Access Control (MAC) address is a unique 6-octet identifier assigned to a network card or network device by the manufacturer. MAC address consists of two parts. The first three octets (24-bit) contain an Organizationally Unique Identifier (OUI). OUI identifies a manufacturer, vendor, or other organization. The Institute of Electrical and Electronics Engineers (IEEE) performs OUI assignments and maintains the OUI database. The last three octets of a MAC address are assigned by the owner of the OUI to form a globally unique device address.

As shown on the diagram below, the two least significant bits of the initial octet (octet 1) have special purposes:

the least significant bit called I/G bit or Group bit;
the second least significant bit called U/L bit or Local bit.

OUIs are assigned with the Local bit set to zero and the Group bit unspecified. If the Local bit is one, the address is considered to be under the control of the local network administrator.

The Group bit identifies the address as either unicast address (I/G=0) or multicast address (I/G=1).