What this means
The IEEE assigned the MA-M block C47C8DD to Anhui GuangXing Linked-Video Communication 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 C4:7C:8D:D, it is Anhui GuangXing Linked-Video Communication Technology Co, Ltd. hardware.