U-Raku, Inc.

Any device whose MAC address begins with C4:63:54 has a network interface built by U-Raku, 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

C4:63:54

Organization

U-Raku, Inc.

Address

401-1 Deba Ritto-shi Shiga JP 520-3041

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.