EmFirst Co., Ltd.

Any device whose MAC address begins with 8C:33:30 has a network interface built by EmFirst 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

8C:33:30

Organization

EmFirst Co., Ltd.

Address

701 Suwon Venture Center Suwon Gyeonggi-do KR 442-833

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.