Teraspek Technologies Co.,Ltd

Any device whose MAC address begins with B4:56:B9 has a network interface built by Teraspek Technologies 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

B4:56:B9

Organization

Teraspek Technologies Co.,Ltd

Address

14th floor,Block C,Beijing International Building, Zhongguancun South Street, Beijng, China, 100081 Beijing CN 100081

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.