Arcadyan Corporation

MA-L

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

Prefix00:12:BF:00:00:00 /24

Vendor address4F, No. 9, Park Avenue II Hsinchu TW 300

RegisteredNov 16, 2004

Block range00:12:BF:00:00:00– 00:12:BF: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 →

Ownership timeline

Nov 16, 2004 – Mar 10, 2026 Arcadyan Technology Corporation name changed
Mar 10, 2026 – present Arcadyan Corporation

Example addresses in this block

00:12:BF:00:00:00 00:12:BF:7F:FF:FF 00:12:BF:FF:FF:FF

Where this block sits

Previous 00:12:BE:00:00:00 /24 Astek Corporation Next 00:12:C0:00:00:00 /24 HotLava Systems, Inc.

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

Arcadyan Corporation holds 90 registered blocks in the IEEE registry, ranking #38 of 33,427 organizations by block count.

Other blocks registered to Arcadyan Corporation

00:1A:2A:00:00:00 /24 MA-L 00:1D:19:00:00:00 /24 MA-L 00:23:08:00:00:00 /24 MA-L 00:26:4D:00:00:00 /24 MA-L 04:09:86:00:00:00 /24 MA-L 04:70:56:00:00:00 /24 MA-L 04:A2:22:00:00:00 /24 MA-L 08:27:A8:00:00:00 /24 MA-L 0C:8E:29:00:00:00 /24 MA-L 18:58:80:00:00:00 /24 MA-L 18:60:41:00:00:00 /24 MA-L 18:82:8C:00:00:00 /24 MA-L