You have to visit the nearest designated HDFC Bank branch to apply in an IPO through ASBA. It is not essential that you hold an Account in that branch, you should hold an Account with the Bank though. Click here for List of Designated Branches Fill in the no. of shares, price, Account number, PAN, Demat Account details, etc. in the specially designed ASBA application form of the IPO you wish to apply for and submit it at the branch. You will receive the acknowledgement from the branch along with the Unique Reference Number. Subsequently, the Bank will block the amount on your highest bid in your specified Bank Account for the IPO as applied. In case of insufficient funds in your Bank Account, the bank will reject the IPO application. After the allotment has been approved, the Bank will debit your Account for the allotment money and will release the block on the remaining amount in the Account. Subsequent to this, the shares will be credited to your Demat Account. You can now download the application forms from the NSE/BSE website. You can also register your Bank/Demat details to avoid filing the same for every issue. Click here to download the form through BSE Click here to download the form through NSE View more