Jide Technology (Hong Kong) Limited

Any device whose MAC address begins with 40:9F:87 has a network interface built by Jide Technology (Hong Kong) Limited. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

40:9F:87

Organization

Jide Technology (Hong Kong) Limited

Address

jiahua Mansion 3F, 133 North 4th Ring Road East, Chaoyang District Beijing CN 100101

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.