EUI-64
付加されたビットをextensionと呼ぶ。
https://gyazo.com/90821769344a694821a86688508acbaa
Mapping an EUI-48 assigned with an MA-S/OUI-36 or MA-M assignment to an EUI-64 potentially creates a duplicate of an EUI-64 assigned with a different MA-S/OUI-36 or MA-M. The IEEE RA has taken appropriate actions to mitigate creation of duplicates based on this mapping but, to protect the integrity of EUI-64 identifiers, this mapping is deprecated.
MA-LはMAC Address Block Largeの略、MA-MはMAC Address Block Mediumの略、MA-SはMAC Address Block Smallの略である。