What this means
The IEEE assigned the MA-L block 8CF0DF to Beijing Zhongyuan Yishang Technology 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 8C:F0:DF, it is Beijing Zhongyuan Yishang Technology Co.,LTD hardware.