The requested vessel with name RETAG and MMSI:0 and IMO:7042849 is temporary not in our database.
Perhaps you mean one of the following ships:

Vessel name IMO MMSI In range Destination Last report
RETAG ALKALII 12927 N/A 403766510 Jun 29, 2017 02:33 UTC

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