The requested vessel with name KNOT SO FAST and MMSI:338085025 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
KNOT SO FAST N/A 338237826 Sep 29, 2017 12:53 UTC

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