Zero1.tv GmbH

Any device whose MAC address begins with C8:C7:91 has a network interface built by Zero1.tv GmbH. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

C8:C7:91

Organization

Zero1.tv GmbH

Address

Heinrich-Roller-Str. 16 B Berlin DE 10405

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.