Shenzhenshi Xinzhongxin Technology Co.Ltd

Any device whose MAC address begins with 04:57:91 has a network interface built by Shenzhenshi Xinzhongxin 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

04:57:91

Organization

Shenzhenshi Xinzhongxin Technology Co.Ltd

Address

Block 3, Dong Huan Industrial Park, Sha Jing Town, Bao’an District, Shenzhen City, Guangdong Province, China ShenZHEN GuangDong CN 518104

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.