The requested vessel with name SEYHAN and MMSI:0 and IMO:5321502 is temporary not in our database.
Perhaps you mean one of the following ships:

Vessel name IMO MMSI In range Destination Last report
SEYHAN CAN N/A 367464070 Feb 20, 2018 11:09 UTC
SEYHAN-4 N/A 271002604 Dec 29, 2017 02:12 UTC
SEYHAN-5 N/A 271010052 Feb 20, 2018 08:11 UTC

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