Nanjing SAC Power Grid Automation Co., Ltd.

Any device whose MAC address begins with 20:DF:3F has a network interface built by Nanjing SAC Power Grid Automation 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

20:DF:3F

Organization

Nanjing SAC Power Grid Automation Co., Ltd.

Address

No.11 Phoenix Road Nanjing Jiangsu CN 211106

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.