Yulong Computer Telecommunication Scientific (Shenzhen) Co.,Ltd

Any device whose MAC address begins with 3C:91:57 has a network interface built by Yulong Computer Telecommunication Scientific (Shenzhen) 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:91:57

Organization

Yulong Computer Telecommunication Scientific (Shenzhen) Co.,Ltd

Address

5F Building 2,No.56,Liuhe Road,Xihu District Hangzhou Zhejiang CN 310023

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.