ALTOS C&C

MA-L

MA-L: a full /24 OUI block, IEEE's largest, covering 16,777,216 addresses.

Prefix00:30:81:00:00:00 /24

Vendor address150-010 RM. 1012, 44-1 KR KOREA

RegisteredSep 8, 2000

Block range00:30:81:00:00:00– 00:30:81:FF:FF:FF

Address capacity16,777,216

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

00:30:81:00:00:00 00:30:81:7F:FF:FF 00:30:81:FF:FF:FF

Where this block sits

Previous 00:30:80:00:00:00 /24 Cisco Systems, Inc Next 00:30:82:00:00:00 /24 TAIHAN ELECTRIC WIRE CO., LTD.

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

ALTOS C&C holds 1 registered blocks in the IEEE registry, ranking #4,855 of 33,421 organizations by block count.