There has been an approach by many SEO people to suggest using a dedicated IP. Generally they are only needed if you are going to use an SSL certificate or need it for you network connection to the internet for example.
As far as SEO goes though, the domain name is going to define your site, not the IP address. The only time it matters is if domains on the SAME IP are linking to each other. These links may be ignored or even get you booted off Google if it appears you are using a number of sites you own to boost your search rankings.
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