Kaertech Limited

MA-M

MA-M: a /28 block, one IEEE assigns within a larger OUI when a full /24 isn't needed, covering 1,048,576 addresses.

Prefix90:4E:91:A0:00:00 /28

Vendor addressUnit 1601, 21-24 Connaught Road West Hong Kong Sheung Wan HK 00000

RegisteredJun 4, 2017

Block range90:4E:91:A0:00:00– 90:4E:91:AF:FF:FF

Address capacity1,048,576

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

90:4E:91:A0:00:00 90:4E:91:A7:FF:FF 90:4E:91:AF:FF:FF

Where this block sits

Previous 90:4E:91:90:00:00 /28 CUTTER Systems spol. s r.o. Next 90:4E:91:B0:00:00 /28 Shanghai JaWay Information Technology Co., Ltd.

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

Kaertech Limited holds 1 registered blocks in the IEEE registry, ranking #17,419 of 33,427 organizations by block count.