Keiyo System Research, Inc.

Any device whose MAC address begins with 00:11:FE has a network interface built by Keiyo System Research, 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

00:11:FE

Organization

Keiyo System Research, Inc.

Address

Hamada park Bldg. 6F Chiba-city Chiba-pref JP 260-0028

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.