The requested vessel with name GREENPORT and MMSI:0 and IMO:5284807 is temporary not in our database.
Perhaps you mean one of the following ships:

Vessel name IMO MMSI In range Destination Last report
GREENPORT N/A 367335260 SI/GREENPORT.FERRY Oct 06, 2017 18:10 UTC
GREENPORTS 1 N/A 211718100 DELFZYL Dec 12, 2017 02:55 UTC

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