MA-L: a full /24 OUI block, IEEE's largest, covering 16,777,216 addresses.
Prefix00:21:2B:00:00:00 /24
Vendor addressThiemannstraße 1 Berlin DE 12059
Country🇩🇪 Germany
RegisteredApr 14, 2008
Block range00:21:2B:00:00:00– 00:21:2B:FF:FF:FF
Address capacity16,777,216
AdministrationUniversally administered: its prefix comes from a block registered through the IEEE Registration Authority
TransmissionUnicast: addressed to a single device
SourceIEEE Registration Authority
Address capacity is the size of this registered block, not a count of devices actually manufactured or online. Registration identifies the organization holding the block, not a specific device model or unit.
Curious how a prefix like this turns into a full address? See how MAC addresses are structured →
Example addresses in this block
Where this block sits
Previous
00:21:2A:00:00:00 /24
Audiovox Corporation
Next
00:21:2C:00:00:00 /24
SemIndia System Private Limited
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
MSA Auer holds 1 registered blocks in the IEEE registry, ranking #20,369 of 33,427 organizations by block count.