What this means
The IEEE assigned the MA-M block 1CA0EFD to Shenzhen Liandian 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 1C:A0:EF:D, it is Shenzhen Liandian Communication Technology Co.LTD hardware.