Switchgear and Instrumentation Ltd

Any device whose MAC address begins with 00:09:61 has a network interface built by Switchgear and Instrumentation Ltd. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

00:09:61

Organization

Switchgear and Instrumentation Ltd

Address

Ripley Road Bradford West Yorkshire GB BD4 7EH

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.