The requested vessel with name SY PANTHERA and MMSI:211611720 and IMO:0 is temporary not in our database.
Perhaps you mean one of the following ships:

Vessel name IMO MMSI In range Destination Last report
SY PANTHERA N/A 211288410 Oct 11, 2017 13:21 UTC

Also, you may try to find the vessel in our comprehensive Vessels Database or track this ship on the map.