Sankosha Corporation

Any device whose MAC address begins with 0C:9E:91 has a network interface built by Sankosha 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

0C:9E:91

Organization

Sankosha Corporation

Address

1-12, Miyashimo Sagamihara-shi Kanagawa-ken JP 252-0212

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.