The requested vessel with name FRENCH WARSHIP D641 and MMSI:228723000 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
FRENCH WARSHIP D621 N/A 245663578 May 26, 2016 13:22 UTC

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