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:C2:57:70:00 /36
Vendor addressc/ Caleruega, 102 2° Planta Madrid ES 28033
Country🇪🇸 Spain
RegisteredJul 30, 2008
Block range00:50:C2:57:70:00– 00:50:C2:57:7F: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
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00:50:C2:57:60:00 /36
Visi-tech Systems Ltd
Next
00:50:C2:57:80:00 /36
Delphi Display Systems, Inc.
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
Advanced Software Technologies holds 1 registered blocks in the IEEE registry, ranking #4,227 of 33,421 organizations by block count.