What this means
The IEEE assigned the MA-L block F8D462 to Pumatronix Equipamentos Eletronicos Ltda.. 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 F8:D4:62, it is Pumatronix Equipamentos Eletronicos Ltda. hardware.