How do I find my 28 digit enrollment number?

Your 28-digit Enrolment ID (EID) is found on the acknowledgement slip received after completing your Aadhaar enrolment. The EID consists of a 14-digit enrolment number followed by a 14-digit date stamp (yyyy/mm/dd/hh/mm/ss format). If you lose the slip, you can retrieve your EID by visiting the official UIDAI website or an Aadhaar enrolment center.