Keystone Microtech Corporation

Any device whose MAC address begins with 28:65:6B has a network interface built by Keystone Microtech 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

28:65:6B

Organization

Keystone Microtech Corporation

Address

9F., No.255, Dong Sec. 1, Jhubei City, Hsinchu County TW 302

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.