TrekStor GmbH

Any device whose MAC address begins with AC:A9:19 has a network interface built by TrekStor 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

AC:A9:19

Organization

TrekStor GmbH

Address

Kastanienallee 8-10 Lorsch Hessen DE 64653

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.