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:CA:50:00 /36
Vendor address5-11 Takinogawa 7-Chome Kita-ku Tokyo JP 114-8515
Country🇯🇵 Japan
RegisteredMay 30, 2010
Block range00:50:C2:CA:50:00– 00:50:C2:CA:5F: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
- May 30, 2010 – Jul 24, 2026 YOKOWO CO.,LTD name changed
- Jul 24, 2026 – present YOKOWO CO., 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.
YOKOWO CO., LTD. holds 2 registered blocks in the IEEE registry, ranking #3,471 of 33,427 organizations by block count.
Other blocks registered to YOKOWO CO., LTD.