What this means
The IEEE assigned the MA-L block 1CA770 to SHENZHEN CHUANGWEI-RGB ELECTRONICS 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:A7:70, it is SHENZHEN CHUANGWEI-RGB ELECTRONICS CO.,LTD hardware.