Retrieving your lost Aadhar No(UID) or the Enrolment No(EID) is very simple if you remember the registered email id or the mobile number you'd given during Aadhaar registration.
So have either one ready:
Your mobile number OR
Your email id
Step 1:Go to UID site
When you go to Find UID/EID you'll be presented with this screen:
Getting back lost Adhaar ID or the Enrolment ID Now fill your name and mobile or your name correctly. If your details are matched then you will get a SMS on your mobile or email. Note: In case of email check in the inbox also it case take 1-2 days for you to receive email.
Step 2: Enter the OTP
Just enter the secret code received in your mobile or email and you'll be shown your Lost Adhaar No or the Enrolment ID.