What this means
The IEEE assigned the MA-L block 04CB88 to Shenzhen Jingxun Software Telecommunication 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 04:CB:88, it is Shenzhen Jingxun Software Telecommunication Technology Co.,Ltd hardware.