You can find here current network vendor information for the ethernet hardware address including vendor address, url for driver download and internet configuration information.registered data
Device mac address: 78:9F:87
Base16 encoding: 789F87
registrar name: Siemens AG I IA PP PRM
Gleiwitzer Strasse 555
Nuremberg Bavaria 90475
URL for specification download: http://cache.automation.siemens.com/dnl/TY/TY1ODgwOQAA_5347565_Appr/E44653122_129729951197988136.pdf
The MACs with the prefix 78-9F-87 belong to the owner Siemens Ag I Ia Pp Prm in Gleiwitzer Strasse 555 Nuremberg Bavaria 90475 Germany. You can find troubleshooting information for the hardware on the manufacturer website there. This registered address pool of 1 blocks can identify max. 16.777.216 devices.