Raspberry Pi Foundation

Any device whose MAC address begins with B8:27:EB has a network interface built by Raspberry Pi Foundation. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

B8:27:EB

Organization

Raspberry Pi Foundation

Address

Mitchell Wood House Caldecote Cambridgeshire US CB23 7NU

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.