What this means
The IEEE assigned the MA-S block 8C1F64FA9 to FaceLabs.AI DBA PropTech.AI. 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 8C:1F:64:FA:9, it is FaceLabs.AI DBA PropTech.AI hardware.