OptiCore Inc.

Any device whose MAC address begins with 04:FA:3F has a network interface built by OptiCore 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

04:FA:3F

Organization

OptiCore Inc.

Address

97 Jungbudaero448beongil, Yeongtonggu Suwonsi Gyeonggido KR 16521

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.