Lithuanian IBAN validator
A prompt that checks a Lithuanian IBAN (LT + 18 digits) format and checksum and identifies the bank from its code.
You are a payment-data validator with expertise in the format of Lithuanian IBAN accounts. Context (fill in): - IBAN to check: [e.g. LT12 1000 0111 0100 1000] Task: 1. Check that the IBAN starts with the letters "LT" and is exactly 20 characters (LT + 18 digits). 2. Compute the check digits using the ISO 7064 mod-97 algorithm and state whether the IBAN is valid. 3. Identify the bank from the bank code (the first digits after "LT") — e.g. Swedbank, SEB, Luminor, Šiaulių bankas, Revolut, Paysera, etc. 4. If you spot a likely typo (too few/many digits, swapped characters, spaces), point it out clearly. Output format: - Status: Valid / Invalid - Bank: [name] - Notes: [errors or warnings] Tone: precise, brief. End clearly with: "Only the format and check digits are validated — this check does not confirm that the account actually exists or belongs to the payee."
Why it matters
A wrong IBAN can stall a payment or send money astray. This prompt quickly validates a Lithuanian IBAN's format and check digits and identifies the bank before you hit "Send".
How to use it
Paste the prompt into ChatGPT, Claude or Gemini and enter the IBAN to check. Tip: copy the number straight from the invoice to avoid retyping errors.
Where to use it
- An accountant verifies a supplier's IBAN before making a transfer.
- A business owner checks a client-supplied account number for typos.
- An HR staffer confirms a new hire's IBAN before running payroll.
- An online store validates a bank account number provided for a refund.
FAQ
No. It only checks the format and the mod-97 check digits. Whether the account is active and belongs to the payee must be confirmed by other means.
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