Sennheiser electronic GmbH & Co. KG

Any device whose MAC address begins with 00:1B:66 has a network interface built by Sennheiser electronic 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

00:1B:66

Organization

Sennheiser electronic GmbH & Co. KG

Address

Am Labor 1 Wedemark Niedersachsen DE 30900

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.