FERMAX ELECTRONICA S.A.U.

Any device whose MAC address begins with 28:04:E0 has a network interface built by FERMAX ELECTRONICA S.A.U.. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

28:04:E0

Organization

FERMAX ELECTRONICA S.A.U.

Address

Tres Cruces 133 Valencia ES 46017

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.