CUIT/ CUIL generator in your mobile phone. Valid only in Argentine. Software in Spanish.

Generador de CUIT / CUIL en su celular. Valido Unicamente para Argentina. Programa en español.

From Wikipedia:

For taxpaying purposes, the CUIT and CUIL (Código Único de Identificación Tributaria, Unique Code for Taxpaying Identification and Código Único de Identificación Laboral, Unique Code for Laboral Identification). It's based on the DNI and appends 2 numbers at the beginning and one at the end. For example, 20 and 23 for men, 30 for women, and one digit at the end. Employees have a CUIL (assigned at the moment the DNI is created), and employers have a CUIT. If a person decides to open a company of its own, his CUIL usually becomes his CUIT. The CUIT was needed because a different identification is required for companies, who can't be identified by a DNI number.

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