The requested vessel with name ALEXANDER K and MMSI:0 and IMO:7703584 is temporary not in our database.
Perhaps you mean one of the following ships:

Vessel name IMO MMSI In range Destination Last report
ALEXANDER K N/A 209353000 Dec 13, 2017 09:31 UTC
ALEXANDER K 7521120 325692000 RIGA Sep 01, 2017 07:07 UTC
ALEXANDER KASHCHUK 9479618 273324590 RUS VNN Jan 01, 2017 20:11 UTC

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