macadress

HYUNDAI HT Co., Ltd.

MA-L
MA-L: a full /24 OUI block, IEEE's largest, covering 16,777,216 addresses.
Prefix00:1D:66:00:00:00 /24
Vendor addressHyundai Telecom Bldg., 4273-12, Shingil-Dong, Youngdungpo-Gu, Seoul KR 150-859
Country🇰🇷  South Korea
RegisteredAug 18, 2007
Block range00:1D:66:00:00:00– 00:1D:66: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. Aug 18, 2007 – Aug 4, 2026 Hyundai Telecom name changed
  2. Aug 4, 2026 – present HYUNDAI HT Co., Ltd.

Example addresses in this block

00:1D:66:00:00:00 00:1D:66:7F:FF:FF 00:1D:66:FF:FF:FF

Where this block sits

Previous 00:1D:65:00:00:00 /24 Microwave Radio Communications Next 00:1D:67:00:00:00 /24 AMEC

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

HYUNDAI HT Co., Ltd. holds 1 registered blocks in the IEEE registry, ranking #15,382 of 33,421 organizations by block count.