The requested vessel with name RUMRUNNER11 and MMSI:503015520 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
RUMRUNNER N/A 338214636 Oct 01, 2016 15:59 UTC
RUMRUNNER II N/A 338075091 Dec 03, 2017 19:56 UTC

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