A-First Technology Co., Ltd.

Any device whose MAC address begins with 00:15:66 has a network interface built by A-First Technology 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

00:15:66

Organization

A-First Technology Co., Ltd.

Address

5F, No. 111-2, Shin-Teh Rd., San-Chung City Taipei Shien TW 241

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.