IEEE 802.3

Any device whose MAC address begins with 00:12:0F has a network interface built by IEEE 802.3. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

00:12:0F

Organization

IEEE 802.3

Address

Oban GB PA34 5EJ

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.