Czech IBAN generator
IBANs in the Czech Republic have 24 characters and start with CZ. The one below is random, follows the national structure and passes the MOD-97 check, so form validation accepts it. No bank issued it.
CZ7520109634054063260887
- Country CZ
- Check digits 75
- Bank code 2010
- Account prefix 963405
- Account number 4063260887
Generate a list Up to 100 IBANs, as CSV, JSON, SQL or plain text
In CSV, JSON and SQL, every IBAN segment (bank, branch, account, check digits) gets its own column.
Test data only. No bank issued this IBAN. Realistic mode: real bank code, random account number. No bank issued this IBAN, but it could match a real account by chance. Never use it for payments.
Check an IBAN
Paste an IBAN from any country to check its length, format and check digits.
Without JavaScript, this form opens the full IBAN validator. Checked in your browser. The IBAN is not sent anywhere and not stored.
Full IBAN validatorCzech IBAN format
Length, pattern and the position of each segment in CZ IBANs, with a sample IBAN.
| IBAN length | 24 |
|---|---|
| BBAN length | 20 |
| BBAN pattern | 20n |
| Structure | CZkk bbbb pppppp cccccccccc |
| Example, electronic | CZ6508000000192000145399 |
| Example, print | CZ65 0800 0000 1920 0014 5399 |
| Letters in the BBAN | None, digits only |
| National check digits | Positions 14, 24 |
| Same structure as | Slovakia (SK) |
| SEPA | Member (EPC list, December 2025) |
| Source | SWIFT IBAN Registry, Release 102 (June 2026) |
Position by position
| Segment | Positions | Example |
|---|---|---|
| Country | 1–2 | CZ |
| Check digits | 3–4 | 65 |
| Bank code | 5–8 | 0800 |
| Account prefix | 9–14 | 000019 |
| Account number | 15–24 | 2000145399 |
In the pattern, n stands for a digit, a for an uppercase letter and c for a letter or digit. The number before each letter is how many characters that block has.
National check digits
Besides the two IBAN check digits, CZ IBANs carry national check digits inside the BBAN, at positions 14, 24. They come from the domestic account number and follow a national rule.
The account prefix and the account number each pass a weighted MOD 11 test: with weights 10, 5, 8, 4, 2, 1 for the prefix and 6, 3, 7, 9, 10, 5, 8, 4, 2, 1 for the number, the sum must be divisible by 11.
This generator calculates them with the official algorithm, in both modes, so validators that check them accept the IBANs on this page.
Source: Česká národní banka, vyhláška č. 169/2011 Sb..
Real bank codes in realistic mode
In realistic mode, the default, the generator takes the bank code from this list and keeps the account number random, so no bank issued these IBANs. With Realistic off, the bank code is random too.
| Bank | Bank code |
|---|---|
| Komerční banka | 0100 |
| ČSOB | 0300 |
| Česká spořitelna | 0800 |
| Fio banka | 2010 |
| MONETA Money Bank | 0600 |
| UniCredit Bank Czech Republic and Slovakia | 2700 |
| Raiffeisenbank | 5500 |
| Air Bank | 3030 |
What to test with CZ IBANs
- Accept exactly 24 characters for CZ, after removing spaces, and reject 23 or 25.
- Digits only after the check digits: a validator for CZ should reject any letter there.
- For a negative test of the national check, change the character at position 14 and recalculate the IBAN check digits (the validator suggests them). The IBAN then passes MOD-97 but fails the national check.
- Same structure as Slovakia (SK). The country code is part of the MOD-97 calculation, so a valid CZ IBAN with another country code in front must fail.
- Ready-made invalid values for negative tests: CZ6508000000192000145390 (last character changed, MOD-97 fails) and CZ650800000019200014539 (one character missing).
- Bank directory checks: by default the generator uses real bank codes such as 0300 (ČSOB), and random ones with Realistic off, so you can test a known and an unknown bank.
About IBANs in the Czech Republic
Czech IBANs share the Slovak layout: 24 characters with a 4-digit bank code, a 6-digit account prefix and a 10-digit account number. The two countries had a single banking system until Czechoslovakia split in 1993.
Questions about IBANs in the Czech Republic
How long is an IBAN in the Czech Republic?
24 characters: the country code CZ, two check digits and a national part (BBAN) of 20 characters.
What does an IBAN from the Czech Republic look like?
For example CZ65 0800 0000 1920 0014 5399. That is the print format, in groups of four. Forms and files usually take it without spaces: CZ6508000000192000145399.
Can Czech IBANs contain letters?
No. After the check digits, CZ IBANs contain only digits: the BBAN pattern is 20n.
Where is the bank code in Czech IBANs?
The bank code, at positions 5–8: 0800 in the registry example. By default (realistic mode) the generator uses real bank codes, such as 0100 for Komerční banka.
Will a test IBAN for the Czech Republic pass validation?
It passes the checks most forms run: country code, length, character format and MOD-97 check digits. The national check digits inside the BBAN are computed with the official algorithm, so a validator that also checks them accepts this IBAN. In realistic mode, the default, the bank code is real too, so a bank directory check accepts it. An account lookup or a payee name check will not confirm it, because the account number is random.
Can I use a generated Czech IBAN to sign up for a service or receive money?
No. It is test data that no bank issued to you. Money sent to it is rejected or, if the number happens to belong to someone, reaches a stranger, and using it for a sign-up, a free trial or a direct debit is misuse. Your own IBAN is in your banking app and on your statements.
Other countries
Pick a country to see its IBAN format and get a valid test IBAN. The number next to each code is the IBAN length.
Western Europe
- Andorra AD IBAN length: 24
- Austria AT IBAN length: 20
- Belgium BE IBAN length: 16
- France FR IBAN length: 27
- Germany DE IBAN length: 22
- Gibraltar GI IBAN length: 23
- Ireland IE IBAN length: 22
- Italy IT IBAN length: 27
- Liechtenstein LI IBAN length: 21
- Luxembourg LU IBAN length: 20
- Monaco MC IBAN length: 27
- Netherlands NL IBAN length: 18
- San Marino SM IBAN length: 27
- Spain ES IBAN length: 24
- Switzerland CH IBAN length: 21
- United Kingdom GB IBAN length: 22
- Vatican City VA IBAN length: 22
Northern Europe
Central and Southern Europe
- Albania AL IBAN length: 28
- Bosnia and Herzegovina BA IBAN length: 20
- Bulgaria BG IBAN length: 22
- Croatia HR IBAN length: 21
- Cyprus CY IBAN length: 28
- Czech Republic CZ IBAN length: 24
- Greece GR IBAN length: 27
- Hungary HU IBAN length: 28
- Kosovo XK IBAN length: 20
- Malta MT IBAN length: 31
- Montenegro ME IBAN length: 22
- North Macedonia MK IBAN length: 19
- Poland PL IBAN length: 28
- Portugal PT IBAN length: 25
- Romania RO IBAN length: 24
- Serbia RS IBAN length: 22
- Slovakia SK IBAN length: 24
- Slovenia SI IBAN length: 19
Eastern Europe and the Caucasus
Middle East
- Bahrain BH IBAN length: 22
- Iraq IQ IBAN length: 23
- Israel IL IBAN length: 23
- Jordan JO IBAN length: 30
- Kuwait KW IBAN length: 30
- Lebanon LB IBAN length: 28
- Oman OM IBAN length: 23
- Palestine PS IBAN length: 29
- Qatar QA IBAN length: 29
- Saudi Arabia SA IBAN length: 24
- Turkey TR IBAN length: 26
- United Arab Emirates AE IBAN length: 23
- Yemen YE IBAN length: 30
Africa
- Algeria DZ IBAN length: 26
- Burundi BI IBAN length: 27
- Djibouti DJ IBAN length: 27
- Egypt EG IBAN length: 29
- Libya LY IBAN length: 25
- Mauritania MR IBAN length: 27
- Mauritius MU IBAN length: 30
- Morocco MA IBAN length: 28
- Sao Tome and Principe ST IBAN length: 25
- Seychelles SC IBAN length: 31
- Somalia SO IBAN length: 23
- Sudan SD IBAN length: 18
- Tunisia TN IBAN length: 24
Asia
Americas
- Brazil BR IBAN length: 29
- British Virgin Islands VG IBAN length: 24
- Costa Rica CR IBAN length: 22
- Dominican Republic DO IBAN length: 28
- El Salvador SV IBAN length: 28
- Falkland Islands (Malvinas) FK IBAN length: 18
- Guatemala GT IBAN length: 28
- Honduras HN IBAN length: 28
- Nicaragua NI IBAN length: 28
- Saint Lucia LC IBAN length: 32
No country matches your search.
Learn about IBANs
IBANpedia explains the IBAN in plain language, from its history to the differences between countries.
- National check digits in the IBAN The check digits many countries keep inside the account number, from the French clé RIB to the Italian CIN, and how they differ from the IBAN ones.
- IBAN and SEPA How the Single Euro Payments Area made the IBAN the only number you need for a euro transfer.
- Test IBANs for developers and QA What validators actually check, the mistakes that break IBAN handling, and how to get test IBANs into your pipeline.
- How IBAN check digits work The MOD-97 method step by step, with a worked example you can follow on paper and a few lines of code.