Telecommunications Industry Association TR-41 Committee

Any device whose MAC address begins with 00:12:BB has a network interface built by Telecommunications Industry Association TR-41 Committee. 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:BB

Organization

Telecommunications Industry Association TR-41 Committee

Address

2500 Wilson Blvd., Suite 300 Arlington VA US 22201

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.