The requested vessel with name KOEI MARU NO11 and MMSI:0 and IMO:8420983 is temporary not in our database.
Perhaps you mean one of the following ships:

Vessel name IMO MMSI In range Destination Last report
KOEI MARU NO 88 9128714 431782000 CAPE TOWN Nov 19, 2017 20:25 UTC
KOEI MARU NO.1 9258064 432228000 CAPE TOWN Oct 07, 2017 16:34 UTC
KOEI MARU NO.78 9682746 432936000 DAKHLA Dec 05, 2017 20:02 UTC

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