CHINA GREATWALL COMPUTER SHENZHEN CO.,LTD

Any device whose MAC address begins with A4:90:05 has a network interface built by CHINA GREATWALL COMPUTER SHENZHEN 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

A4:90:05

Organization

CHINA GREATWALL COMPUTER SHENZHEN CO.,LTD

Address

409,2#,Greatwall Bldg,No.3 Kefa Road,Science & Industry Park,Nanshan District, Shenzhen Guangdong CN 51807

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.