PROTECH SYSTEMS CO., LTD.

Any device whose MAC address begins with 00:90:05 has a network interface built by PROTECH SYSTEMS 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

00:90:05

Organization

PROTECH SYSTEMS CO., LTD.

Address

5F, NO. 34, LANE 80, SEC. 3 TAIPEI TW

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.