The requested vessel with name YELLOWSTONE and MMSI:0 and IMO:5224948 is temporary not in our database.
Perhaps you mean one of the following ships:

Vessel name IMO MMSI In range Destination Last report
YELLOWSTONE N/A 367682820 Feb 20, 2018 18:40 UTC
YELLOWSTONE 9225251 565042000 HOUSTON Feb 20, 2018 15:59 UTC

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