IBIBAN & SWIFT Tools

CZ · ISO 13616

Czech Republic IBAN — format, length, example & validator

IBANs issued in Czech Republic are 24 characters long and begin with the country code CZ. Validate a Czech Republic IBAN below, or read on for the full structure, an example, and how the MOD 97 check digits work.

Valid CZ IBAN — passes all checks

Free · client-side · no data uploaded

Country code
CZ
Total length
24 chars
Check-digit algo
MOD 97-10
ISO 13616 pattern
4!n6!n10!n
4 digits (digits (0–9)), then 6 digits (digits (0–9)), then 10 digits (digits (0–9))

How a Czech Republic IBAN is structured

A Czech Republic IBAN is read left to right: a 2-letter ISO 3166 country code (CZ), 2 MOD 97 check digits, then a 20-character BBAN. The BBAN is split into 3 fields: 4 digits, 6 digits, 10 digits.

Country code
ISO 3166 — Czech Republic
CZ
Check digits
MOD 97-10 checksum
62
BBAN field 1
4 digits · digits (0–9)
0123
BBAN field 2
6 digits · digits (0–9)
012345
BBAN field 3
10 digits · digits (0–9)
0123456789

Czech Republic IBAN example

A sample Czech Republic IBAN that passes all checks (format, length, MOD 97):

Formatted
CZ62 0123 0123 4501 2345 6789
CZ6201230123450123456789

How Czech Republic IBAN check digits work

The two digits at positions 3–4 are a MOD 97-10 checksum computed from the country code and the BBAN. To verify it, the IBAN is rearranged (BBAN first, country code and check digits last), letters are converted to numbers (A = 10, B = 11, …), and the whole integer is taken mod 97. A valid IBAN has a remainder of 1. This catches any single-digit typo and most transposition errors — which is why a one-character mistake is enough to make a Czech Republic IBAN fail validation instantly.

Czech Republic IBAN FAQ

How long is a Czech Republic IBAN?
A Czech Republic IBAN is always 24 characters long: 2 letters for the country code (CZ), 2 check digits, and a 20-character BBAN. Any Czech Republic IBAN that is shorter or longer than 24 characters is invalid.
What country code does a Czech Republic IBAN start with?
A Czech Republic IBAN starts with the ISO 3166 country code CZ. The first two characters are always CZ, followed by two MOD 97 check digits, then the country-specific BBAN.
How do I validate a Czech Republic IBAN?
Paste the IBAN into the validator on this page — it checks the character set, the 24-character length, and the MOD 97 check digits, all in your browser. You can also open the full IBAN validator with a Czech Republic example pre-filled.
Does a valid Czech Republic IBAN mean the account exists?
No. Validation only confirms the IBAN is structurally well-formed and the check digits are correct per ISO 13616. It does not verify the account exists, is open, or belongs to anyone. Always confirm with the recipient or their bank before sending money.
Czech Republic IBAN format →Czech Republic IBAN example →Open full validator

⚠️ Validation only checks structure and check digits against ISO 13616. A valid Czech Republic IBAN does not guarantee the account exists or is open. Always confirm with the recipient or their bank before initiating a transfer.