What this means
The IEEE assigned the MA-M block C863142 to Tymphany Acoustic Technology (Huizhou) Co., Ltd.. Every network interface they manufacture under this block has a MAC address beginning with these digits, followed by a unique per-device identifier. If a device on your network shows a MAC starting C8:63:14:2, it is Tymphany Acoustic Technology (Huizhou) Co., Ltd. hardware.