What this means
The IEEE assigned the MA-M block 7050E7A to Guangzhou Tianhe High Tech Industrial Development Zone Zhongsheng Electrical Limited Company. 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 70:50:E7:A, it is Guangzhou Tianhe High Tech Industrial Development Zone Zhongsheng Electrical Limited Company hardware.