Heinzmann GmbH & CO. KG

Any device whose MAC address begins with 34:9D:90 has a network interface built by Heinzmann 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

34:9D:90

Organization

Heinzmann GmbH & CO. KG

Address

Am Haselbach 1 Schoenau Baden Wuertemberg DE 79677

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.