The requested vessel with name ISTOK and MMSI:211169920 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
ISTOK+1BARZA N/A 478108000 NOVI SAD Dec 17, 2016 14:18 UTC

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