What is a 36-bit Organizationally Unique Identifier (OUI-36)?
The OUI-36 is a registry activity name, which was replaced by the MA-S registry product name as of January 1,
2014. It includes both a unique 36-bit number used in some standards and the assignment of a block of EUI-48 and
EUI-64 identifiers by the IEEE Registration Authority. The owner of a previously assigned OUI-36 registry
product may continue to use the assignment.
Currently, the OUI-36 only refers to a 36-bit unique number used in some standards. The OUI-36 of the MA-S
assignment may be appended with 12 organization-supplied bits to form an EUI-48, or with 28
organization-supplied bits to form an EUI-64 (the identifier blocks assigned with an MA-S). Applications using
an MA-S should make no assumptions about the bit pattern present in the (24-bit most-significant) OUI portion of
the assigned OUI-36.