CS Instruments Asia

IAB

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:D8:55:05:10:00 /36

Vendor addressRoom 31, Cambridge Plaza, Tower B Hong Kong HK 000008

Country🇭🇰 Hong Kong

RegisteredDec 2, 2012

Block range40:D8:55:05:10:00– 40:D8:55:05:1F: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

40:D8:55:05:10:00 40:D8:55:05:17:FF 40:D8:55:05:1F:FF

Where this block sits

Previous 40:D8:55:05:00:00 /36 ATG UV Technology Next 40:D8:55:05:20:00 /36 DAN ELECTRONICS SYSTEM (P) LIMITED

The nearest registered blocks of the same size on either side of this one in IEEE's address space.

CS Instruments Asia holds 1 registered blocks in the IEEE registry, ranking #9,443 of 33,421 organizations by block count.