What this means
The IEEE assigned the MA-M block D0D94FA to Shenzhen FDC Electuonic 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 D0:D9:4F:A, it is Shenzhen FDC Electuonic Co.,Ltd. hardware.