Check the welcome kit or account opening documents
Look at your HDFC Bank passbook
Check your bank statement
Log in to HDFC NetBanking and view your profile details
Open the HDFC MobileBanking app and check account details
Check SMS or email sent by HDFC Bank after account opening
Call HDFC Bank customer care and verify your identity to get it
Visit the nearest HDFC Bank branch with valid ID proof
Use the HDFC Bank account statement or cheque book where the customer ID may be printed