If I shutdown Linux server which run level it will go

 If you shutdown linux server it goes to the run level 0

init run levels	target	meaning
0	shutdown.target	Shutdown
1	emergency.target	Single-user (can retrieve your password)
2	rescure.target	Multi-user (non-network)
3	multi-user.target	Multi-user (with internet)
4	no	Reserved, unallocated
5	graphical.target	graphic interface
6	no	The system is restarted