macadress

GES Co, Ltd

MA-L
MA-L: a full /24 OUI block, IEEE's largest, covering 16,777,216 addresses.
Prefix00:12:3D:00:00:00 /24
Vendor addressRoom 710, Bundang Technopark, 700 Gyeonggi-Do KR 463-400
Country🇰🇷  South Korea
RegisteredSep 2, 2004
Block range00:12:3D:00:00:00– 00:12:3D: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

  1. Sep 2, 2004 – Nov 15, 2014 GES name changedaddress changed
  2. Nov 15, 2014 – present GES Co, Ltd

Example addresses in this block

00:12:3D:00:00:00 00:12:3D:7F:FF:FF 00:12:3D:FF:FF:FF

Where this block sits

Previous 00:12:3C:00:00:00 /24 Second Rule LLC Next 00:12:3E:00:00:00 /24 ERUNE technology Co., Ltd.

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

GES Co, Ltd holds 1 registered blocks in the IEEE registry, ranking #13,562 of 33,427 organizations by block count.