Derek(Shaoguan)Limited

Any device whose MAC address begins with 40:00:E0 has a network interface built by Derek(Shaoguan)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

40:00:E0

Organization

Derek(Shaoguan)Limited

Address

Gaojiling,Taiping Town, Shixing County Shaoguan Guangdong CN 512500

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.