Grandex International Corporation

Any device whose MAC address begins with 40:51:6C has a network interface built by Grandex International Corporation. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

40:51:6C

Organization

Grandex International Corporation

Address

4F, 525 Chung Cheng Road Hsin Tien Dist. New Taipei City TW 231

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.