Slovak IBAN generator

IBANs in Slovakia have 24 characters and start with SK. The one below is random, follows the national structure and passes the MOD-97 check, so form validation accepts it. No bank issued it.

Country

Format

Realistic

SK0602009489777691872458

New IBAN

Country SK
Check digits 06
Bank code 0200
Account prefix 948977
Account number 7691872458

Generate a list Up to 100 IBANs, as CSV, JSON, SQL or plain text

How many

File format

In CSV, JSON and SQL, every IBAN segment (bank, branch, account, check digits) gets its own column.

MOD-97 valid

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.

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Slovak IBAN format

Length, pattern and the position of each segment in SK IBANs, with a sample IBAN.

IBAN length	24
BBAN length	20
BBAN pattern	`20n`
Structure	`SKkk bbbb pppppp cccccccccc`
Example, electronic	`SK3112000000198742637541`
Example, print	`SK31 1200 0000 1987 4263 7541`
Letters in the BBAN	None, digits only
National check digits	Positions 14, 24
Same structure as	Czech Republic (CZ)
SEPA	Member (EPC list, December 2025)
Source	SWIFT IBAN Registry, Release 102 (June 2026)

Position by position

Segment	Positions	Length	Example
Country	1–2	2	`SK`
Check digits	3–4	2	`31`
Bank code	5–8	4	`1200`
Account prefix	9–14	6	`000019`
Account number	15–24	10	`8742637541`

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, SK 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: Národná banka Slovenska, opatrenie č. 8/2009.

How national check digits work

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
VÚB banka	`0200`
Slovenská sporiteľňa	`0900`
Tatra banka	`1100`
ČSOB	`7500`
Prima banka	`5600`
UniCredit Bank Czech Republic and Slovakia	`1111`
365.bank	`6500`

What to test with SK IBANs

Accept exactly 24 characters for SK, after removing spaces, and reject 23 or 25.
Digits only after the check digits: a validator for SK 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 Czech Republic (CZ). The country code is part of the MOD-97 calculation, so a valid SK IBAN with another country code in front must fail.
Ready-made invalid values for negative tests: SK3112000000198742637542 (last character changed, MOD-97 fails) and SK311200000019874263754 (one character missing).
Bank directory checks: by default the generator uses real bank codes such as 0900 (Slovenská sporiteľňa), and random ones with Realistic off, so you can test a known and an unknown bank.

About IBANs in Slovakia

Slovak IBANs are 24 characters long: a 4-digit bank code, a 6-digit account prefix and a 10-digit account number. The prefix is often all zeros. Slovakia adopted the euro in 2009.

Questions about IBANs in Slovakia

How long is an IBAN in Slovakia?

24 characters: the country code SK, two check digits and a national part (BBAN) of 20 characters.

What does an IBAN from Slovakia look like?

For example SK31 1200 0000 1987 4263 7541. That is the print format, in groups of four. Forms and files usually take it without spaces: SK3112000000198742637541.

Can Slovak IBANs contain letters?

No. After the check digits, SK IBANs contain only digits: the BBAN pattern is 20n.

Where is the bank code in Slovak IBANs?

The bank code, at positions 5–8: 1200 in the registry example. By default (realistic mode) the generator uses real bank codes, such as 0200 for VÚB banka.

Will a test IBAN for Slovakia 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 Slovak 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.

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