CableWorld Ltd.

Any device whose MAC address begins with B4:00:9C has a network interface built by CableWorld 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

B4:00:9C

Organization

CableWorld Ltd.

Address

Kondorfa u. 6/B Budapest HU 1112

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.