A-FOUR TECH CO., LTD.

Any device whose MAC address begins with 00:1A:40 has a network interface built by A-FOUR TECH 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

00:1A:40

Organization

A-FOUR TECH CO., LTD.

Address

6F, No. 108, Min-Chuan Rd., Hsin-Tien Taipei TW 23141

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.