GoogleSites: Found over 4008 domains hosted on the same web server as reynoldshigh.net (184.108.40.206).
JustHost: Found 162 domains hosted on the same web server as earthbound3d.net (220.127.116.11).
1and1: Found 121 domains hosted on the same web server as darkscarab.com (18.104.22.168).
HostGator: Found 9 domains hosted on the same web server as howtominecraft.net (22.214.171.124).
Of course, this isn't a COMPLETELY fair comparison, as it is up to circumstance. Who knows, I could be on a new server on HostGator
Reverse IP lookups are extremely useful if you want to monitor others' cpu usage on your shared server. Site running slow lately? Probably because one of your neighbors is using too many scripts or getting too much traffic. You can do a SiteReport.org on them to figure it out.
And by the way IrascibleOne, darkscarab.com came up with this notice:
"It appears that the web server located at 126.96.36.199 may be hosting one or more web sites with explicit content. The web sites in question are highlighted in red below. There is a possibility that all of the web sites on this web server may be blocked by web filtering software. Search engine rankings for these web sites may be affected as well."
It does appear you are on the same server with at least two adult sites. I would do a tad bit of research on 1and1's T&L, but it is within your legal right to demand those sites be taken down or your site be moved to another server (with 1and1's customer service, not really recommended).
Don't worry, reynoldshigh.net is hosted with waaaay more adult sites on its GoogleSites server.
And if you wanted to have some reverse IP fun of your own, I totally recommend this:
http://www.yougetsignal.com/tools/web-s ... eb-server/
EDIT: Right, so just to be fair, I looked up another random HostGator server:
Found 662 domains hosted on the same web server as 188.8.131.52.
So clearly I need to do more research on how these hosts decide to group their customers. Not to mention the quality of their servers. Currently, I am guessing it's all based on traffic and cpu usage, more investigation to come.
EDIT2: Well, after actually clicking around on the sites hosted on this server, I am beginning to see a definite pattern. Most of these are either parked domains (1 page ads) or simple blogs (very little traffic). I still find it pretty interesting.
I know longer know the purpose of this post.