Wingtech Group (HongKong) Limited

Any device whose MAC address begins with C4:57:81 has a network interface built by Wingtech Group (HongKong) Limited. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

C4:57:81

Organization

Wingtech Group (HongKong) Limited

Address

FLAT/RM 1903 19/F PODIUM PLAZA 5HANOI ROAD TSIM SHA TSUI Hong Kong Hong Kong HK 999077

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.