FORMOSA21 INC.

Any device whose MAC address begins with 00:18:83 has a network interface built by FORMOSA21 INC.. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

00:18:83

Organization

FORMOSA21 INC.

Address

8F-6, NO.351, CHUNG SHAN RD., SEC.2 TAIPEI TW 235

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.