The requested vessel with name ANIVA and MMSI:0 and IMO:6421713 is temporary not in our database.
Perhaps you mean one of the following ships:

Vessel name IMO MMSI In range Destination Last report
ANIVA 8826371 273437810 PUSAN Dec 20, 2017 01:35 UTC

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