China Unicom Online Information Technology Co.,Ltd

Any device whose MAC address begins with 04:38:DC has a network interface built by China Unicom Online Information Technology 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

04:38:DC

Organization

China Unicom Online Information Technology Co.,Ltd

Address

133 Xidan North St, Xicheng District, Beijing Beijing CN 100000

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.