The requested vessel with name GIANNI R and MMSI:0 and IMO:5256989 is temporary not in our database.
Perhaps you mean one of the following ships:

Vessel name IMO MMSI In range Destination Last report
GIANNI RIVERA N/A 247066180 Jan 21, 2018 18:58 UTC

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