What's Class C IP

I've just recently searched for the same information and I thought some webmaster might be interested to know what are class C of IPs. If you are doing link building for your site, you should heard something like don't exchange link with the same C class of ips website as it's bad in the eyes of Googgle bot. Google discourages unnatural cross linking of your own sites using the same anchor keywords to achieve high ranking. No one know how true the information was, it's just a rumours how google search engine works to prevent site owner from buying lots of domain and cross linking among the sites to manipulate the rankings. Of course google se has other ways to prevent spamming such as the age of the domain & how trustable the site is. So if you want to make your link building campaign more naturally, it's advisable to get a link from different Class C of IPs than yours.

Let's see how does a normal IP looks like: aaa.bbb.CCC.xxx - I think now it's very clear to you even without further explanation. Did you see the C parts? That's the C class of IP. To determine if your sites are in the same C class of IPs, for example:

111.111.111.1 and 111.111.111.2 are in the "same" C Class
111.111.111.1 and 111.111.222.1 are in the "different" C Class

Some smaller hosting companies manage a single or very few C classes of IPs, thus it's hard to get multiple different C Class of IP with the same hosting company. Some larger hosting companies have wider range of C Classes Ips & even B Class but unless you request your sites to be on a different C Class of IP you might still end up on the same C Class of IPs.

This information was found on a forum, it might not be accurate. But it's an easy way to understand what's class c ip and give you an good idea on what you should look for in finding host for your sites.