Beijing Sinead Technology Co., Ltd.

Any device whose MAC address begins with 3C:9F:C3 has a network interface built by Beijing Sinead Technology 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:9F:C3

Organization

Beijing Sinead Technology Co., Ltd.

Address

Room 504,Block A, New material Building, Yongfeng industrial, Haiding District, Beijing.China Beijing Beijing CN 100094

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.