Citibank credit card and debit card customers can generate OTP for IVR transactions by sending the following SMS from their registered mobile number:
OTP XXXX to 52484 or 9880752484
where XXXX corresponds to the last 4 digits of the credit card or debit card whose OTP is being generated
The OTP will remain valid for 30 minutes or the first transaction attempt, whichever is earlier.
For more details on generating Citibank OTP for IVR transactions, you may contact Citibank customer support at http://www.online.citibank.co.in/customerservice/citiphone.htm