Split a German IBAN into bank code (BLZ) and account number (KTO) while running the ISO 13616 Mod-97 checksum locally.
Supports German IBANs with 22 characters.
The first four characters of the IBAN.
Digits 5–12 of a German IBAN.
Digits 13–22 including leading zeros.
Enter a German IBAN with 22 characters.
Tip: Prefill the form with ?iban=… ?iban=DE21301204000000015228
The International Bank Account Number (IBAN) is a globally standardised format for identifying bank accounts across borders.
It combines a country code, two checksum digits and domestic routing details such as bank codes and account numbers.
Every German IBAN contains:
Move the first four characters to the end, replace letters with numbers (A=10 … Z=35) and interpret the result as an integer. A valid IBAN leaves a remainder of 1 when divided by 97.
With 8-digit bank codes and 10-digit account numbers, Germany alone can represent 100 billion unique combinations inside the IBAN format.
The checksum helps catch transposed or mistyped digits before a transfer is sent.