York Instruments Ltd

Any device whose MAC address begins with B4:30:C0 has a network interface built by York Instruments 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

B4:30:C0

Organization

York Instruments Ltd

Address

The Biocentre, York Science Park York North Yorkshire GB YO10 5NY

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.