What this means
The IEEE assigned the MA-L block C8A3E8 to CLOUD NETWORK TECHNOLOGY SINGAPORE PTE. 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:A3:E8, it is CLOUD NETWORK TECHNOLOGY SINGAPORE PTE. LTD. hardware.