Nordwestdeutsche Zählerrevision

Any device whose MAC address begins with 00:25:F3 has a network interface built by Nordwestdeutsche Zählerrevision. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

00:25:F3

Organization

Nordwestdeutsche Zählerrevision

Address

Ing. Aug. Knemeyer GmbH & Co. KG Bad Laer Niedersachsen DE 49196

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.