China Telecom Corporation Limited

Any device whose MAC address begins with 20:AC:9C has a network interface built by China Telecom Corporation Limited. 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:AC:9C

Organization

China Telecom Corporation Limited

Address

31 Jinrong Street, Xicheng District, Beijing, China Beijing, China CN 100033

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.