The requested vessel with name JYU40881 and MMSI:310378531 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
JYU FU NO.588 N/A 416000915 Feb 19, 2018 02:37 UTC
JYUHO MARU N/A 431002468 >JP MIZ B Nov 27, 2017 04:13 UTC
JYUNKOUMARU N/A 431009591 Feb 19, 2018 07:45 UTC
JYURYOU MARU N/A 431007732 Dec 10, 2017 01:11 UTC
JYUSEN MARU N/A 431002454 Feb 21, 2018 21:40 UTC

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