Optonic GmbH

Any device whose MAC address begins with 78:52:4A has a network interface built by Optonic 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

78:52:4A

Organization

Optonic GmbH

Address

Zollhallenstr. 11 Freiburg DE 79106

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.