MAC address blocks by registry type

Every IEEE registry type, from classic MA-L OUIs to small MA-S allocations and CID company identifiers.

MAC address or OUI prefix Look up

Registry	Blocks	Addresses	Organizations	Countries
MA-L	40,296	676 billion	19,845	102
MA-M	6,618	6.9 billion	6,054	84
CID	220	3.7 billion	215	28
MA-S	7,212	29.5 million	5,370	81
IAB	4,575	18.7 million	3,812	65

Complete as of the current IEEE registry deploy. Dates are when each registration was first observed in public data, not legal assignment dates.