Yi chip Microelectronics (Hangzhou) Co., Ltd

Any device whose MAC address begins with B4:C1:70 has a network interface built by Yi chip Microelectronics (Hangzhou) 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:C1:70

Organization

Yi chip Microelectronics (Hangzhou) Co., Ltd

Address

Suite 401, Building #13, No. 498 Guoshoujing Rd., Pudong Shanghai CN 201210

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.