HAJEN

Any device whose MAC address begins with 40:DC:9D has a network interface built by HAJEN. 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:DC:9D

Organization

HAJEN

Address

102-1302, Sinwon-ro 88, Yeongtong-gu Suwon-Si Gyeonggi-do KR 16681

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.