If the PAN card is lost or you wish to have a new PAN card with existing details, then you can apply for a duplicate PAN card by submitting the Form for "Request for New PAN Card Or/ and Changes or Correction in PAN Data" and a copy of FIR may be submitted along with the form.
If the PAN card is lost and you don't remember your PAN, then in such a case, you can know your PAN by using the facility of "Know Your PAN" provided by the Income-tax Department. This facility can be availed of from the website of Income-tax Department - www.incometaxindia.gov.in
After knowing the PAN you can apply for a duplicate PAN card by submitting the "Request For New PAN Card Or/ And Changes Or Correction in PAN Data".
An applicant is required to fill all the columns in the form but should not tick any of the boxes on the left margin.