Posystech Inc., Co.

Any device whose MAC address begins with 00:12:3A has a network interface built by Posystech Inc., Co.. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

00:12:3A

Organization

Posystech Inc., Co.

Address

Room 407, Daeryung Techno Town 6, Seoul KR 153-771

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.