The requested vessel with name ROTHENSEE and MMSI:211555320 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
ROTHENSEE N/A 244870065 ROTTERDAM Feb 21, 2018 09:38 UTC

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