It's not just the IP but everything. For instance if the IPs are different but the whois is the same then Google might still figure it out and see the relationship.
If you are just making normal sites and not planning on doing anything sketchy I wouldn't worry about it too much. Google probably can determine with a high degree of accuracy whether a site is on dedicated or shared hosting. Further it probably knows enough to not penalize sites which are completely unrelated -- in other words there are no shared direct links -- simply because they share an IP (but say have totally different Whois and structures). With all the sites on shared hosting it would be ridiculous for Google to penalize all the other sites on that same IP simply for that reason alone.
|