What this means
The IEEE assigned the MA-L block 74FB17 to Qingdao Goertek Horizons Tecnology 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 74:FB:17, it is Qingdao Goertek Horizons Tecnology Co.,LTD hardware.