The requested vessel with name JEFFERSON and MMSI:0 and IMO:5166952 is temporary not in our database.
Perhaps you mean one of the following ships:

Vessel name IMO MMSI In range Destination Last report
JEFFERSON 5091286 367107330 Feb 17, 2018 21:47 UTC
JEFFERSON N/A 367004790 NEW ORLEANS Mar 20, 2017 15:54 UTC

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