Telink Semiconductor (Shanghai) Co., Ltd.

Any device whose MAC address begins with 3C:CF:B4 has a network interface built by Telink Semiconductor (Shanghai) 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

3C:CF:B4

Organization

Telink Semiconductor (Shanghai) Co., Ltd.

Address

No. 1500 Zuchongzhi Rd, Building #3 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.