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What is an Organizationally Unique Identifier (OUI)?

April 26, 2017identifier organizationally OUI

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What is an Organizationally Unique Identifier (OUI)?

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An OUI/”company_id” is a 24-bit globally unique assigned number referenced by various standards. For example, the OUI is used in the family of 802 LAN standards: Ethernet, Token Ring, etc. The OUI is usually concatenated with other bits that are assigned by that organization in order to make a globally unique EUI-48 or EUI-64. For example, the Ethernet MAC Address is an EUI-48, unique to one particular Ethernet interface. There are other uses of the OUI however, such as its use as a company identifier in the SNAP protocol.