The requested vessel with name FALKVAG and MMSI:258574000 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
FALKVAG 5266013 667001293 MALTA Jul 30, 2016 07:39 UTC

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