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 (001645) represents that it belongs to Champa branch in district Janjgir Champa of Chhattisgarh.
IFSC code (ANDB0001645) 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 You can also verify the same by contacting bank authority of Andhra Bank since data here could be outdated.
Champa branch of Andhra Bank is in Chhattisgarh state of India.
NH-200,ANUPAM PLAZA, CORBA PARA, CHAMPA, CHAMPA, CHHATISGARH-495671