Test-Um Inc.

Any device whose MAC address begins with 00:0B:7B has a network interface built by Test-Um Inc.. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

00:0B:7B

Organization

Test-Um Inc.

Address

808 Calle Plano Camarillo CA US 93012

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.