Free CNPJ validator. Verify a Brazilian company tax number's check digits, see whether it is a headquarters or branch, and generate CNPJs for testing.
Free CPF validator. Check a Brazilian CPF's check digits instantly, see the issuing region, and generate valid CPF numbers for software testing.
Free CUIT and CUIL validator. Check the Argentine tax ID check digit, identify whether it belongs to an individual or a company, and generate test numbers.
Free CURP validator. Check the 18-character Mexican CURP, its check digit, birth date and state code, and see what the code encodes.
Free EIN validator. Check whether a US Employer Identification Number uses an IRS-assigned prefix and see which campus issued it.
Free NIT validator. Work out the Colombian NIT check digit (dígito de verificación) and confirm a tax number is well formed.
Free RUC validator. Check the Peruvian RUC check digit, see whether it belongs to an individual or a company, and generate test numbers.
Free RUT validator. Check the Chilean RUT/RUN check digit (including K), tell individuals from companies, and generate valid RUTs for testing.
Free SIN validator. Check a Canadian Social Insurance Number against the Luhn algorithm and see whether it is a temporary-resident series.
Free SSN format checker. Test whether a US Social Security Number uses a structure the SSA actually issues. No generator is offered.