extended unique identifier (IPv6) (EUI)
The Extended Unique Identifier (EUI) is an addressing scheme defined by IEEE, with which all globally existing components can be uniquely identified.
The EUI address format has a length of 64 bits, which is why it is also referred to as EUI-64. This address format can be used to uniquely identify networks, nodes, interfaces and other components.
The EUI scheme has a length of 64 bits and consists of a 24-bit long bit sequence that identifies the organization, the Organization Unique Identifier( OUI), and a 40-bit long extension identifier that provides sufficient scope for more comprehensive addresses. The EUI-64 format is designed to fit the 48-bit MAC address used in local area networks.
In the IPv6 protocol, the EUI-64 scheme is used for the interface identifier, the unique interface identifier in subnets.