i.s.t isdn-support technik GmbH

Any device whose MAC address begins with 00:04:65 has a network interface built by i.s.t isdn-support technik 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

00:04:65

Organization

i.s.t isdn-support technik GmbH

Address

Rhein Strasse 7E DE

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.