Dear Aspirant,

It is your enrollment number/roll number for the institute/university/college. If you have a roll number provided by your college then you have to fill in that number there. Some colleges have called it by enrollment number.

Hope this helps. Thank you.

Hello
sharad singh , The institute registration number is same as roll number or we can say that your enrollment number if you have still confused then contact your institute to know your registration number.

Hope you understand and it will be helpful for you :)