The study of Internet diffusion in Italy uses a unique methodology at a European level. In particular, the study is based on the "penetration rate" (PR), which measures Internet diffusion on the basis of the ratio between the number of .it domain names and the resident population, taking into account the various typologies of registrant subjects.

The "penetration rate" gives an objective description of Internet diffusion at a national, macro-area (North, Centre, and South), regional and provincial level.