Sony Corporation

Any device whose MAC address begins with 3C:01:EF has a network interface built by Sony Corporation. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

3C:01:EF

Organization

Sony Corporation

Address

1-7-1 Konan Minato-ku Tokyo JP 108-0075

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.