In IGNOU, a control number is an automatically generated 10 or 11-digit unique code that is sent to students after the successful payment of admission fees. It serves as an identification number and is proof that the IGNOU Head Office has received the students online application for a particular program. The control number allows students to check their IGNOU admission status for the current session. It is also used to obtain study materials, download tickets for events, and login to the IGNOU student portal. The control number can be found in the students email inbox. The difference between the control number and enrollment number in IGNOU is that the control number is generated automatically after the payment of admission fees, while the enrollment number is assigned to the student after the verification of their admission. To check the admission status in IGNOU, students need to enter their enrollment number, subject applied, and date of birth on the IGNOU website.