Raspberry Pi Trading Ltd

Any device whose MAC address begins with E4:5F:01 has a network interface built by Raspberry Pi Trading Ltd. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

E4:5F:01

Organization

Raspberry Pi Trading Ltd

Address

Maurice Wilkes Building, Cowley Road Cambridge GB CB4 0DS

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.