ISB Corporation

Any device whose MAC address begins with 04:BF:A8 has a network interface built by ISB Corporation. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

04:BF:A8

Organization

ISB Corporation

Address

1-2-1 Shinyokohama, Kohoku-ku Yokohama Kanagawa JP 222-0033

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.