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EUI-64 Definition: EUI-64 (Extended Unique Identifier-64) is an identifier used in IPv6 addressing, where the 48-bit MAC address of a network interface card is extended to 64 bits by inserting "FFFE" in the middle.
EUI-64, or Extended Unique Identifier-64, is a method used in IPv6 addressing to assign unique 64-bit interface identifiers to network devices. This identifier is derived from the 48-bit MAC address of the device, with EUI-64 extending it to 64 bits by inserting a fixed 16-bit value in the middle. The resulting EUI-64 address aids in automatic address configuration for IPv6 networks.