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.
Prefix40:D8:55:15:F0:00 /36
Vendor addressNizhni Krasnoselsky st.,35 Moscow RU 140070
Country🇷🇺 Russia
RegisteredAug 25, 2013
Block range40:D8:55:15:F0:00– 40:D8:55:15:FF: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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40:D8:55:15:E0:00 /36
Prodco International Inc.
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40:D8:55:16:00:00 /36
Thermo Fisher Sceintific
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
CT Company holds 21 registered blocks in the IEEE registry, ranking #163 of 33,421 organizations by block count.
Other blocks registered to CT Company
18:74:E2:30:00:00 /28
MA-M
00:50:C2:46:20:00 /36
IAB
00:50:C2:85:60:00 /36
IAB
00:50:C2:A8:20:00 /36
IAB
00:50:C2:B6:F0:00 /36
IAB
00:50:C2:CA:30:00 /36
IAB
00:50:C2:DC:B0:00 /36
IAB
00:50:C2:E9:20:00 /36
IAB
00:50:C2:F2:40:00 /36
IAB
00:50:C2:FB:30:00 /36
IAB
40:D8:55:07:20:00 /36
IAB
70:B3:D5:00:50:00 /36
MA-S