Guntermann & Drunck GmbH

Any device whose MAC address begins with 00:0F:F4 has a network interface built by Guntermann & Drunck 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

00:0F:F4

Organization

Guntermann & Drunck GmbH

Address

Obere Leimbach 9 Siegen NRW DE 57074

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.