Niigata Power Systems Co., Ltd.

Any device whose MAC address begins with 3C:6A:7D has a network interface built by Niigata Power Systems Co., 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

3C:6A:7D

Organization

Niigata Power Systems Co., Ltd.

Address

7-26,Tatsumi 3-Chome Koto-ku TOKYO JP 135-0053

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.