UK IBAN generator
IBANs in the United Kingdom have 22 characters and start with GB. The one below is random, follows the national structure and passes the MOD-97 check, so form validation accepts it. No bank issued it.
GB49SRLG60837190169366
- Country GB
- Check digits 49
- Bank code SRLG
- Branch code 608371
- Account number 90169366
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 validatorUK IBAN format
Length, pattern and the position of each segment in GB IBANs, with a sample IBAN.
| IBAN length | 22 |
|---|---|
| BBAN length | 18 |
| BBAN pattern | 4a6n8n |
| Structure | GBkk bbbb ssssss cccccccc |
| Example, electronic | GB29NWBK60161331926819 |
| Example, print | GB29 NWBK 6016 1331 9268 19 |
| Letters in the BBAN | Positions 5–8: always letters |
| National check digits | None |
| Same structure as | Ireland (IE) |
| SEPA | Member (EPC list, December 2025) |
| Source | SWIFT IBAN Registry, Release 102 (June 2026) |
Position by position
| Segment | Positions | Example |
|---|---|---|
| Country | 1–2 | GB |
| Check digits | 3–4 | 29 |
| Bank code | 5–8 | NWBK |
| Branch code | 9–14 | 601613 |
| Account number | 15–22 | 31926819 |
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.
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 | Branch code |
|---|---|---|
| NatWest | NWBK |
607080 |
| Barclays | BARC |
201147 |
| HSBC | MIDL |
404246 |
| Santander UK | ABBY |
090099 |
| Nationwide | NAIA |
070116 |
| Monzo | MONZ |
040004 |
| Starling Bank | SRLG |
608371 |
What to test with GB IBANs
- Accept exactly 22 characters for GB, after removing spaces, and reject 21 or 23.
- Letters are required at positions 5–8. Test lowercase input too, and convert it to uppercase before you validate.
- Same structure as Ireland (IE). The country code is part of the MOD-97 calculation, so a valid GB IBAN with another country code in front must fail.
- Ready-made invalid values for negative tests: GB29NWBK60161331926810 (last character changed, MOD-97 fails) and GB29NWBK6016133192681 (one character missing).
- Bank directory checks: by default the generator uses real bank codes such as BARC (Barclays), and random ones with Realistic off, so you can test a known and an unknown bank.
About IBANs in the United Kingdom
UK IBANs are 22 characters long. The BBAN starts with a 4-letter bank code taken from the bank's BIC, followed by the 6-digit sort code and the 8-digit account number that people in the UK use for domestic payments. UK banks started issuing IBANs in April 2001, and the UK stayed in SEPA after leaving the EU. GB IBANs are also used in Jersey, Guernsey and the Isle of Man.
Questions about IBANs in the United Kingdom
How long is an IBAN in the United Kingdom?
22 characters: the country code GB, two check digits and a national part (BBAN) of 18 characters.
What does an IBAN from the United Kingdom look like?
For example GB29 NWBK 6016 1331 9268 19. That is the print format, in groups of four. Forms and files usually take it without spaces: GB29NWBK60161331926819.
Can UK IBANs contain letters?
Yes. GB IBANs always have uppercase letters at positions 5–8: NWBK in the registry example.
Where is the bank code in UK IBANs?
The bank code, at positions 5–8: NWBK in the registry example. The branch code is at positions 9–14 (601613). By default (realistic mode) the generator uses real bank codes, such as NWBK for NatWest.
Will a test IBAN for the United Kingdom pass validation?
It passes the checks most forms run: country code, length, character format and MOD-97 check digits. 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 UK 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.
- 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.
- IBAN formats by country Why a Norwegian IBAN has 15 characters and a Maltese one 31, with the format of every country we support.