Digium

Any device whose MAC address begins with 00:0F:D3 has a network interface built by Digium. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

00:0F:D3

Organization

Digium

Address

445 Jan Davis Drive NW Huntsville AL US 35806

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.