The requested vessel with name MITRIDAT and MMSI:0 and IMO:6923761 is temporary not in our database.
Perhaps you mean one of the following ships:

Vessel name IMO MMSI In range Destination Last report
MITRIDAT N/A 273378480 Feb 23, 2018 15:18 UTC

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