Viewcooper Corp.

Any device whose MAC address begins with 88:91:66 has a network interface built by Viewcooper Corp.. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

88:91:66

Organization

Viewcooper Corp.

Address

Room 1061, A,Seven Block, No.128 Huayuan Rd SHANGHAI CN 200083

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.