Thing-talk Wireless Communication Technologies Corporation Limited

Any device whose MAC address begins with B4:5C:A4 has a network interface built by Thing-talk Wireless Communication Technologies Corporation 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

B4:5C:A4

Organization

Thing-talk Wireless Communication Technologies Corporation Limited

Address

498 Guo Shou Jing Road, Suite 10402 Shanghai CN 201203

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.