ISIN Validator

ISIN is short for "International Securities Identification Number" and is a 12-character alphanumeric code that uniquely identifies securities globally.

Every ISIN code is exactly 12 characters, split into parts that each encode something specific. Those rules are hard to read by eye. The validator on this page breaks any code into its parts and labels what each one means.

Checking a ISIN code by hand means verifying its length, character format, and any checksum digit. That is easy to get wrong. Enter a code on this page and the validator runs all three checks at once, then explains why it passed or failed.

ISIN codes are issued by National Numbering Agencies (NNAs), overseen by the Association of National Numbering Agencies (ANNA) under the ISO 6166 standard. One authority and one shared standard are what let the same code identify the same instrument across markets and data providers.

Most checkers return only pass or fail. This one breaks a ISIN code down position by position and explains in plain language what each part means. For codes that map to a single security, it also links to that specific stock.