The first four characters (ANDB) represents that it belongs to Andhra Bank. The fifth character (0) is reserved for future use. The last 6 characters (001691) represents that it belongs to Rudrapur branch in district Madhubani of Bihar.
IFSC code (ANDB0001691) can be found on the front page of the account holder's passbook or in cheque leaf. You can also verify the same by contacting bank authority of Andhra Bank since data here could be outdated.
Rudrapur branch of Andhra Bank is in Bihar state of India.
PLOT NO.2, AVAS VIKAS, RUDRAPUR, DIST. UDHAM SINGH NAGAR-263153