The requested vessel with name REO and MMSI:0 and IMO:6720171 is temporary not in our database.
Perhaps you mean one of the following ships:

Vessel name IMO MMSI In range Destination Last report
REODOR N/A 257653700 Nov 16, 2017 09:05 UTC

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