You can get all types of results searching for things like:
rv.net/stats
rv.net stats
rv.net server stats
and some other similar key words. You can also add 'forum' to the searches.
For many sites, you can just put the address/stats into your browser and will get the stats on the site, however either rv.net have it turned off or are using different keywords.
This is a good example of the stats servers keep track of;
http://www.speedguide.net/stats/Keep in mind that OS, addresses, browsers and such can be spoofed...
Advertising sites such as Alexa, track traffic as well...