Synthetic QA data · GB

United Kingdom test IBAN numbers

Ten checksum-valid United Kingdom test IBANs with their domestic bank code, sort code and account number, ready for a payment form, fixture or unit test, plus invalid GB cases that a correct validator must reject.

Synthetic only: the bank code may belong to a real United Kingdom bank, but each account number is random. Never use these values for payments or to represent a real account.

22characters

GBcountry code

18BBAN characters

YesSEPA country

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Valid United Kingdom test IBANs

IBAN	Bank code	Sort code	Account number	Bank (public registry)
GB29 PAED 1757 1130 9530 08	PAED	175711	30953008	PAYSEND PLC, Kirkcaldy	Check
GB02 BOFA 6984 0857 7937 58	BOFA	698408	57793758	BANK OF AMERICA, N.A. LONDON, Bromley	Check
GB21 VEBA 6949 9612 7268 16	VEBA	694996	12726816	NOVEBA LIMITED	Check
GB16 CLYD 0180 9739 5769 03	CLYD	018097	39576903	CLYDESDALE BANK PLC, Glasgow	Check
GB25 TSBS 8834 3626 3940 16	TSBS	883436	26394016	TSB BANK PLC (FORMERLY LLOYDS TSB SCOTLAND PLC), Aberdeen	Check
GB74 TSBS 6484 6965 6296 88	TSBS	648469	65629688	TSB BANK PLC (FORMERLY LLOYDS TSB SCOTLAND PLC), Aberdeen	Check
GB17 TSBS 2803 0290 2386 85	TSBS	280302	90238685	TSB BANK PLC (FORMERLY LLOYDS TSB SCOTLAND PLC), Aberdeen	Check
GB64 RAPH 9040 1780 4950 53	RAPH	904017	80495053	R RAPHAELS AND SONS PLC, London	Check
GB22 COUT 6047 3023 1752 85	COUT	604730	23175285	COUTTS & CO	Check
GB46 BOFA 2292 8997 4693 17	BOFA	229289	97469317	BANK OF AMERICA, N.A. LONDON, Bromley	Check

Invalid GB IBANs for negative tests

Each value is derived from the first valid IBAN above and re-checked, so the expected result is exact.

Case	Input	Expected validator result
Wrong check digits	GB30PAED17571130953008	Reject: MOD-97 checksum fails
Transposed BBAN digits	GB29APED17571130953008	Reject: MOD-97 checksum fails
One character too short	GB29PAED1757113095300	Reject: length does not match the country format
Wrong country prefix	FR29PAED17571130953008	Reject: length or checksum fails for the other country
Lowercase with spaces	gb29 paed 1757 1130 9530 08	Accept after normalizing case and whitespace

United Kingdom IBAN format

GB + 2 check digits + 4 uppercase letters + 6 digits + 8 digits = 22 characters. Validate the length and character classes first, then the MOD-97 checksum: move the first four characters to the end, convert letters to numbers (A=10 … Z=35) and the remainder modulo 97 must be 1.

Need rows for the same bank, city or BIC your integration talks to? The generator can target them, keep a stable seed and export 1,000 rows at a time.

curl -X POST https://ibangen.com/api/v1/generate \
  -H "X-API-Key: $IBANGEN_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"country": "UK", "quantity": 100}'

Test against real bank structures, not just checksums

Free: 10 GB rows at a time. Pro adds bank targeting, 1,000-row batches, CSV/JSON exports and the API; Business adds exact BIC and branch targeting.

Target a United Kingdom bank Get an API key Validate an IBAN

Questions

Are these United Kingdom test IBANs real bank accounts?

No. They are synthetic GB IBANs with a correct national format and MOD-97 checksum. The bank code can match a real institution, but the account number is random and must never be used for payments.

How long is a United Kingdom IBAN?

A United Kingdom IBAN has 22 characters: the country code GB, two check digits and a 18-character BBAN (4 uppercase letters, 6 digits, 8 digits).

Can I get more United Kingdom test IBANs for a specific bank or city?

Yes. The United Kingdom generator creates up to 10 rows free. Paid plans add bank, city and exact BIC targeting, 1,000-row batches, CSV/JSON exports and the same data through the API.

IBANgen provides synthetic QA data. It does not verify account ownership, balances, reachability or payment execution.