What this means
The IEEE assigned the MA-L block B48107 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 B4:81:07, it is SHENZHEN CHUANGWEI-RGB ELECTRONICS CO.,LTD hardware.