Spain CIF Validator
Online Spanish corporate Código de Identificación Fiscal (CIF) validator. Verify sum and control rules.
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How does CIF validation work?
Validation checks the first organizational letter (must be in the official list), the 7 central digits, and the final control digit or letter.
The checksum multiplies odd positions by 2 (summing product digits if > 9) and even positions by 1. The remainder of a division by 10 defines the control digit (0 to 9 or letters J to I). If the CIF violates the exclusive letter or number rules for its corresponding category, it is marked as invalid.