Ison Technology Co., Ltd.

Any device whose MAC address begins with 40:D3:57 has a network interface built by Ison 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

40:D3:57

Organization

Ison Technology Co., Ltd.

Address

Room 6, 20F, No. 77, section 1, Xintai 5th Rd. Xizhi District New Taipei City Taiwan TW 22101

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.