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 Dec 16, 2017 14:00 UTC
DEMONAX N/A 225017460 Sep 04, 2017 19:14 UTC
DEMONIO DE TASMANIA N/A 224515770 Dec 17, 2017 07:52 UTC
DEMONSTR.INSTALLATIE N/A 246901008 DUISBURG Oct 25, 2017 07:27 UTC

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