COMPUTER SOCIETY MICROPROCESSOR & MICROPROCESSOR STANDARDS C

Any device whose MAC address begins with 00:A0:3F has a network interface built by COMPUTER SOCIETY MICROPROCESSOR & MICROPROCESSOR STANDARDS C. 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:A0:3F

Organization

COMPUTER SOCIETY MICROPROCESSOR & MICROPROCESSOR STANDARDS C

Address

% APPLE COMPUTER, INC. CUPERTINO CA US 95014

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.