If you are planning to host on Airbnb or other short-term rental platforms in Lombardy (for example in Lake Como), understanding CIR  and CIN  is essential. These codes reflect important regulatory changes recently introduced by the Italian government — and they impact what you need to do to host legally. This guide explains what they are, why they matter, the steps to obtain them, your ongoing obligations, and how to stay fully compliant. ✅ What are CIR and CIN? CIR — Codice