SIMEX Sp. z o.o.

Any device whose MAC address begins with FC:50:90 has a network interface built by SIMEX Sp. z o.o.. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

FC:50:90

Organization

SIMEX Sp. z o.o.

Address

ul. Wielopole 7 Gdañsk pomorskie PL 80-556

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.