What if I forgot my application number?
The application number is contained in the confirmation e-mail sent after checking the e-mail address. To get the individual application, go to the ESTA home page, select “Check ESTA Status” in the navigation menu and click “Check individual Status”. If you do not know your application number, enter your passport number, country of citizenship, date of passport issuance, passport expiration date, and date of birth.
NOTE: The information entered for the application must match exactly the information entered in the ESTA application. Any discrepancy between the information entered to retrieve the application and the information entered in the application itself will result in the message “Application not found” or “Application expired”.