ISNI Validator

About this calculator

The ISNI (International Standard Name Identifier) is a 16-digit identifier — formatted as four groups of four characters — assigned to public identities such as authors, performers, researchers and organizations, so the same person or entity can be recognized consistently across libraries, publishing databases and rights-management systems, much like an ISBN identifies a book.

The final character of an ISNI is a check digit computed with the ISO 7064 MOD 11-2 algorithm over the preceding 15 digits, letting any system detect a mistyped or corrupted ISNI without needing to look it up in a database. This calculator recomputes that check digit from the ISNI you enter and confirms whether it matches, showing the expected check character.