The Codice Fiscale is a unique tax ID assigned to anyone who lives in Italy for fiscal reasons and needed for a variety of purposes from opening a bank account to purchasing a car or house.
Italian citizens are automatically assigned a fiscal code at birth. Those moving to Italy from abroad need to apply for one either from the Italian ambassy in their country of origin or from the Italian Revenue Agency (Agenzia delle Entrate) in their new place of residence in Italy.
It is also possible to have a professional representative apply on your behalf.
The tax code can be "calculated" from your demographic data, since it's a combination of your Name, Surname, date of birth, and place of birth. It is also possible to "reverse engineer" a codice fiscale to track down personal information about its owner.
The tool hereby provided is an unofficial Italian tax code generator and may not be 100% accurate. In order to check if a codice fiscale is valid online, it is best to use the official tool provided by Agenzia delle Entrate.