Hengstler GmbH

Any device whose MAC address begins with 0C:21:38 has a network interface built by Hengstler 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

0C:21:38

Organization

Hengstler GmbH

Address

Uhlandstrasse49 Aldingen BW DE 78554

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.