About us

Namso Gen is a free tool for developers and QA teams who need card numbers for testing payment forms and integrations. It generates numbers that pass the Luhn (MOD 10) checksum and have the right length for the BIN you enter, with optional expiry dates and CVVs. Generation runs entirely in your browser; the numbers are never sent to our servers.

Namso Gen is built and operated by Senty Pty Ltd, a company registered in Australia.

Generated numbers are test data. They are not linked to any account, have no balance and cannot be used for real payments. Payment gateways usually only accept their own documented test cards in sandbox mode, so we also maintain a reference of official sandbox test cards, each linked to the provider's documentation and re-checked periodically.

Alongside the generator we publish a Luhn validator, a BIN checker based on the card networks' published IIN ranges, and guides on BINs, the Luhn algorithm, security codes, 3D Secure and gateway testing. Technical content is checked against primary sources such as ISO/IEC 7812, PCI DSS, the EMV 3-D Secure specification and the payment providers' own documentation. If you spot an error, please tell us.