Guangdong East Power Co.,

Any device whose MAC address begins with 30:89:99 has a network interface built by Guangdong East Power Co.,. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

30:89:99

Organization

Guangdong East Power Co.,

Address

No.6 Northern Industry Road,Songshan lake SCI&TECH Industry Park DongGuan GuangDong CN 523808

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.