IAB: an Individual Address Block, a /36 covering 4,096 addresses. IEEE's predecessor to MA-S; no longer issued, but existing assignments remain valid.
Prefix00:50:C2:91:30:00 /36
Vendor addressChristopher Martin Road Basildon Essex GB SS14 3EL
Country🇬🇧 United Kingdom
RegisteredJul 30, 2008
Block range00:50:C2:91:30:00– 00:50:C2:91:3F:FF
Address capacity4,096
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 →
Ownership timeline
- Jul 30, 2008 – Jun 18, 2021 Leonardo MW Ltd (Land & Naval Defence Electronic) name changedaddress changed
- Jun 18, 2021 – present Leonardo UK Ltd
Example addresses in this block
Where this block sits
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
Leonardo UK Ltd holds 3 registered blocks in the IEEE registry, ranking #1,154 of 33,427 organizations by block count.
Other blocks registered to Leonardo UK Ltd