The requested vessel with name MALLINA and MMSI:503512050 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
MALLINA 9351775 503512000 PORT HEDLAND Feb 21, 2018 15:56 UTC

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