Zhen Shi Information Technology（Shanghai）Co.,Ltd.

Any device whose MAC address begins with 30:C9:1B has a network interface built by Zhen Shi Information Technology（Shanghai）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

30:C9:1B

Organization

Zhen Shi Information Technology（Shanghai）Co.,Ltd.

Address

5F, Building 3?No. 401 Caobao Road, Xuhui District, Shanghai, ChinaShanghai Shanghai CN 200233

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.