CNStats 3.2 Manual
This report differs from the report "Referrers" in displaying only server URL instead of page URL, for instance:
Thus, the report allows estimating general scheme of links to your site (sources of requests).
Like in referring pages, only servers with unique visitors (new hosts) are displayed by default. It is possible to view the whole list (per users or per pageviews) with the help of the additional menu.