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Originally Posted by BradM
Here's a question I've wanted to know and this is a good a place as any to ask it.
If I am interlinking my network, should each site be on its own class C? Say 20 sites. Does having them all on the exact same IP devalue the link weight?
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Again, ask 10 experts, get 10 different answers.
Well respected SEO
Bruce Clay observed the following:
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Yes! We recommend that any site serious about their rankings spend the money (it's only a few extra bucks a month) to be on a dedicated IP.
It?s important for a few reasons. First, we?re pretty sure it plays at least a small part in the search engine?s algorithms. The engines will use reverse lookup to determine what kind of IP you?re on. If you think they don?t care, consider this: It?s been said that about 3 percent of all Web sites have dedicated IPs, with the other 97 percent resting on shared IPs. Research was then conducted analyzing the top 50 results for certain queries in the various search engines. The research found that 90 percent of the top-50 results were using dedicated IP numbers.
Three percent of Web sites use them, and 90 percent of Web sites in the top 50 results have them. Counterintuitive, don?t you think?
We thought so. In fact, we?ve found it so odd we repeated the tests several times, and each time we got the same results. We?ve even seen cases where switching from a virtual IP to a dedicated IP number alone has caused an increase in rankings.
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As far as interlinking sites sharing the same Class C (or IP), it has been suggested that linking two sites on the same IP carries about as much weight as an internal link.