What this means

The IEEE assigned the MA-L block 00071D to Satelsa Sistemas Y Aplicaciones De Telecomunicaciones, S.A.. 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 00:07:1D, it is Satelsa Sistemas Y Aplicaciones De Telecomunicaciones, S.A. hardware.