Adolf Tedsen GmbH & Co. KG

Any device whose MAC address begins with 80:42:7C has a network interface built by Adolf Tedsen GmbH & Co. KG. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

80:42:7C

Organization

Adolf Tedsen GmbH & Co. KG

Address

Otto-Hahn-Str. 13-15 Trittau Schleswig-Holstein DE D-22946

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.