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 (001806) represents that it belongs to Agartala branch in district West Tripura of Tripura.
IFSC code (ANDB0001806) 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 You can also verify the same by contacting bank authority of Andhra Bank since data here could be outdated.
Agartala branch of Andhra Bank is in Tripura state of India.
SHREE RAM COMPLEX, OLD THANA LANE, KASHARIPATTI, AGARTALA - 799001