Director Identification Number: mandatory identity fields and PAN requirement to enable online DIN processing and prevent duplicate DINs. The Ministry requires Name, Father's name, Date of Birth, PAN for Indian nationals and Passport for foreign nationals as mandatory fields in DIN 1 to enable system examination of DIN 4 and prevent duplicate DINs; existing DIN holders who did not furnish PAN must file DIN 4 to furnish PAN.