The requested vessel with name DEMON and MMSI:0 and IMO:5011016 is temporary not in our database.
Perhaps you mean one of the following ships:

Vessel name IMO MMSI In range Destination Last report
DEMON N/A 235031497 Oct 19, 2017 14:35 UTC
DEMONAX N/A 225017460 Sep 04, 2017 19:14 UTC
DEMONIO DE TASMANIA N/A 224515770 Oct 15, 2017 05:31 UTC

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