Woojyun Systec Co., Ltd.

Any device whose MAC address begins with 00:07:3F has a network interface built by Woojyun Systec Co., Ltd.. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

00:07:3F

Organization

Woojyun Systec Co., Ltd.

Address

4F Han Yang B/D, Yoido-dong Seoul KR 150-010

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.