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:F4:50:00 /36
Vendor addressRzepakowa 5e Krakow malopolska PL 31-989
Country🇵🇱 Poland
RegisteredFeb 26, 2012
Block range00:50:C2:F4:50:00– 00:50:C2:F4:5F: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 →
Example addresses in this block
Where this block sits
Previous
00:50:C2:F4:40:00 /36
Steinbichler Optotechnik GmbH
Next
00:50:C2:F4:60:00 /36
Reason Tecnologia S.A.
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
Husty M.Styczen J.Hupert Sp.J. holds 7 registered blocks in the IEEE registry, ranking #426 of 33,421 organizations by block count.
Other blocks registered to HUSTY M.Styczen J.Hupert Sp.J.