The requested vessel with name COS HOLP VESSEL 4 and MMSI:503595400 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
COS HOLP VESSEL 3 N/A 503595300 Dec 31, 2016 14:28 UTC
COS HOLP VESSEL 6 N/A 503595600 Dec 30, 2016 02:39 UTC

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