Shenzhen Tencent Computer System Co., Ltd.

Any device whose MAC address begins with 1C:78:39 has a network interface built by Shenzhen Tencent Computer System 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

1C:78:39

Organization

Shenzhen Tencent Computer System Co., Ltd.

Address

36/F, Tencent Building, Kejizhongyi Avenue, Hi-Tech Park Shenzhen Guangdong CN 518057

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.