FERMILAB

Any device whose MAC address begins with 00:80:55 has a network interface built by FERMILAB. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

00:80:55

Organization

FERMILAB

Address

P.O. BOX 500, MS-234 BATAVIA IL US 60510

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.