CUSIP Validator
Paste a CUSIP to check whether its check digit is correct.
Computed locally in your browser with the CUSIP modulus-10 double-add-double check-digit scheme. Your CUSIP stays only on this page.
Validate a CUSIP check digit
Paste a 9-character CUSIP (an 8-character base plus a check digit) to confirm its check digit and read off the corrected value when the digit is wrong. The check digit uses the modulus-10 double-add-double scheme over the alphanumeric base, where digits keep their value and letters map A=10 through Z=35. Surrounding whitespace is ignored. Need to create valid fixtures instead? Try the CUSIP generator.