United Kingdom IBAN Validator & Format Checker
Validate and decode any United Kingdom International Bank Account Number (IBAN). Test the structure against the official format mask, check digits, and run an offline bank lookup.
United Kingdom IBAN Structure Rules
Every International Bank Account Number in United Kingdom follows a standardized format registry layout:
| Country Code | GB (United Kingdom) |
| Total Length | 22 characters |
| SEPA Member | Yes (SEPA Member) |
| Structure Format Mask | GB82 WEST 1234 5698 7654 32 |
| BBAN Regex Pattern | ^[A-Z]{4}[0-9]{14}$ |
| Bank Code Range | Characters 5 to 8 (4 digits) |
| Branch Code Range | Characters 9 to 14 (6 digits) |
| Account Number Range | Characters 15 to 22 (8 digits) |
Frequently Asked Questions
How long is a United Kingdom IBAN?
A United Kingdom IBAN consists of exactly 22 characters. It starts with the country code 'GB', followed by two check digits, and then the Basic Bank Account Number (BBAN).
What is the format of a United Kingdom IBAN?
The official format mask for a United Kingdom IBAN is 'GB82 WEST 1234 5698 7654 32'. The BBAN component matches the structure pattern '^[A-Z]{4}[0-9]{14}{{FAQ_ACCORDION}}#039;.
Does United Kingdom participate in SEPA?
United Kingdom is a member of the Single Euro Payments Area (SEPA). Euro payments can be processed under SEPA rules.
How do I decode a United Kingdom IBAN?
A United Kingdom IBAN can be decoded into: the country code 'GB' (characters 1-2), check digits (characters 3-4), and the domestic bank account identifier containing the bank identifier (characters 5-8), and branch code (characters 9-14), and account number (characters 15-22).