You can use this website to generate your non official Codice Fiscale:
1. Go to this website: http://www.paginebianche.it/codice-fiscale
2. Fill the form & click “calcola”.
3. Your non official tax code is generated for you.
This non official Codice Fiscale you can use in websites that asks you for an Italian tax code to buy stuff online. Example events tickets from ticketmaster.it or order something else online from Italian online shops.
Remembe that this process will not create an official Italian tax code – Codice Fiscale!
Be aware that if you ever need a real Italian tax code, the one you create using the website mentioned here may not be 100% accurate and is not valid in many cases.
Example for the apartment owners to register your Italian rent contract for more than 30 days. But in this case they have 30 days to register the contract with Agenzie delle Entrate offline or online so you have plenty of time to apply for one, when already here in Italy.
P.S.: If you need an official Codice Fiscale, then you must go to the offices of the Agenzia della Entrate or delegate an acquaintance to do it for you.
I’d be more than glad to be able to help: Get Codice Fiscale online for 39 €
Long explanation how to generate non official Italian tax code (link to another webpage):
How to create Italian Tax code – Codice Fiscale – online