# CUSIP Validator Validate 9-character CUSIP North American securities identifiers with mod-10 check-digit verification, issuer base and issue-number breakdown. > Canonical page: https://elysiatools.com/en/tools/cusip-validator - **Category:** Validation - **Keywords:** cusip, securities, stock, bond, north america, check digit, nsin ## Overview The CUSIP Validator is a dedicated utility designed to verify 9-character North American securities identifiers. It performs mod-10 check-digit verification and breaks down the identifier into its constituent parts, including the issuer base and issue number, ensuring your financial data is accurate and compliant. ## Inputs - **CUSIP Code** (text): 9-character CUSIP. Spaces and dashes are tolerated. ## When to use - When auditing financial records containing North American stocks or bonds to ensure CUSIP codes are valid. - Before uploading securities data into portfolio management systems or trading platforms. - When troubleshooting failed transactions or clearing errors caused by potentially mistyped securities identifiers. ## How it works - Enter the 9-character CUSIP code into the input field, with or without spaces and dashes. - The tool strips formatting and extracts the 6-character issuer base, the 2-character issue number, and the final check digit. - It runs the mod-10 algorithm on the first 8 characters to calculate the expected check digit. - The calculated check digit is compared against the provided 9th character to confirm validity and display the breakdown. ## Use cases - Validating CUSIP lists extracted from legacy databases before migration. - Verifying bond identifiers in corporate treasury reports. - Double-checking stock symbols and CUSIPs during trade reconciliation. ## Frequently asked questions ### What is a CUSIP number? A CUSIP is a 9-character alphanumeric code used to identify North American securities, such as stocks and bonds. ### How does the mod-10 check-digit verification work? It applies a mathematical formula to the first 8 characters, converting letters to numbers, to determine if the 9th character matches the expected checksum. ### Can I input CUSIPs with spaces or dashes? Yes, the validator automatically ignores spaces, dashes, and formatting characters during validation. ### What information does the breakdown provide? It separates the CUSIP into the 6-character issuer identifier, the 2-character issue type, and the 1-character check digit. ### Does this tool verify if the security is currently active? 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