Gibraltar IBAN validator
How the IBAN format works
- Format
- GI + 2 check digits + 4-letter bank code + 15-char account number (23 chars)
- Example
- GI75NWBK000000007099453
Things to watch for
- 23 characters total
- Checks structure and checksum only, not that the account exists
^GI[0-9]{2}[A-Z]{4}[0-9A-Z]{15}$A Gibraltar IBAN is 23 characters: “GI”, two check digits, a 4-letter bank code, and a 15-character alphanumeric account block. Gibraltar is a British Overseas Territory that shares the pound sterling and much of its banking style with the UK, but it’s regulated separately by the Gibraltar Financial Services Commission and issues IBANs under its own “GI” prefix rather than under “GB” — a distinction worth knowing if you’re used to seeing UK-format account details from a Gibraltar-based bank, insurer, or gaming company. The 4-letter bank code follows the same convention as UK bank codes, so it’s often recognizable if you already deal with UK institutions.
How this validator works
This tool checks for the “GI” prefix, confirms the bank-code block is exactly 4 letters, confirms the account block is 15 alphanumeric characters, and then runs the mod-97 (ISO 7064) checksum a correctly generated Gibraltar IBAN must satisfy — entirely client-side in your browser, with nothing sent to a server and no signup.
What a pass doesn’t tell you
A pass confirms the 23 characters are well-formed and internally consistent, not that the account exists, is open, or belongs to whoever you’re expecting to pay. This tool performs no lookup against any Gibraltar bank or the Gibraltar Financial Services Commission’s records. If a Gibraltar IBAN fails, check whether a letter in the bank code was mistaken for a similarly shaped digit, or vice versa, in the 15-character account block that follows it.
Scope: Gibraltar IBAN structure and mod-97 checksum validation only — not payment processing, bank verification, or confirming an account is active. Use it to catch a typo before a transfer fails.
Content last reviewed 2026-07-09.
IBAN FAQ
What does a Gibraltar IBAN look like?
23 characters: 'GI', two check digits, a 4-letter bank code, and a 15-character account block that can hold digits and letters — for example GI75NWBK000000007099453. The bank-code style mirrors the letter-based codes UK banks use.
Gibraltar uses the British pound — why does it need its own IBAN prefix instead of GB?
Gibraltar is a British Overseas Territory with its own financial regulator (the Gibraltar Financial Services Commission) and its own banking system, so despite the shared currency and close UK ties, IBANs registered there use the distinct 'GI' country prefix rather than being folded into 'GB'.
Does a passing result mean the Gibraltar account is genuine?
No — this tool only confirms the 23 characters are correctly structured and pass the mod-97 checksum. It does no bank-name resolution and never contacts a Gibraltar bank, so it can't confirm the account is open, active, or held by a specific person or company.