Keico Hightech Inc.

Any device whose MAC address begins with 00:21:30 has a network interface built by Keico Hightech Inc.. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

00:21:30

Organization

Keico Hightech Inc.

Address

Ace twin tower I, 12th Fl. Seoul KR 152-050

Source

IEEE OUI registry

Have a full MAC address? Look it up— we'll also tell you if it's a randomized (private) address rather than a real manufacturer prefix.