EXFO

Any device whose MAC address begins with 00:03:01 has a network interface built by EXFO. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

00:03:01

Organization

EXFO

Address

400 Godin Avenue Quebec G1M 2K2 CA

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.