The requested vessel with name SEGESTA and MMSI:0 and IMO:6805270 is temporary not in our database.
Perhaps you mean one of the following ships:

Vessel name IMO MMSI In range Destination Last report
SEGESTA N/A 238893840 /3)*%+ Feb 21, 2018 14:17 UTC

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