CTS-Clima Temperatur Systeme GmbH

Any device whose MAC address begins with 00:11:91 has a network interface built by CTS-Clima Temperatur Systeme 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

00:11:91

Organization

CTS-Clima Temperatur Systeme GmbH

Address

Lotzenäcker 21 Hechingen Baden-Württemberg DE 72379

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.