Chiyoda Electronics Co.,Ltd.

Any device whose MAC address begins with 40:B3:CD has a network interface built by Chiyoda Electronics 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:B3:CD

Organization

Chiyoda Electronics Co.,Ltd.

Address

1-3-11 Nishiki-cho Warabi Saitama JP

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.