I've heard some rumors that Google will devalue sites that are similar and hosted on the same IP range. I have dozens of domain names and our own servers. I want to know if I should spread these domains out over various other servers like godaddy, hostgator, etc or go even further and purchase an SEO hosting package which spreads domains across several C Class IP ranges. I want to build value for these domains over time by adding daily unique and targeted content but similar content and links will appear on all the sites. Thanks.
Unless its a spam network, or VERY similar content / layout don't worry about the IP range. I have 500 sites on one cluster and have had no issues for the past 3 years.