Free tools / IBAN checker

Free IBAN checker and validator

Check whether an IBAN is valid: country length, format and the mod-97 checksum. Nothing is sent to a bank and nothing is stored.

The result appears here as JSON.

One free check per tool and IP address per day. Nothing is stored.

What you get

The checksum (ISO 13616, mod 97) and the length registered for the country
The IBAN in compact and grouped form, with its country and BBAN

Not returned: Whether the account exists or who owns it.

Use it from code or an agent

curl "https://api.ambolt.dev/v1/iban-validate?iban=DK50+0040+0440+1162+43&free=1"

Same tool as an MCP tool (iban_validate, free at 30 requests a minute), as a pay-per-call endpoint ($0.003 a call in USDC) and as an Apify Actor. Reference · Docs

Questions

Does this check that the account exists?

No. It validates the number itself, which catches typing mistakes before a payment is attempted.

Which countries are supported?

All countries in the IBAN registry. For a country it does not know, only the checksum is checked and the answer says so.

Is the IBAN stored?

No. It is checked and discarded.