Each Dedicated server you purchase comes with a stack of 5 IP addresses. They can be used for different purposes.
For example, you may want to assign a different IP address to each one of the accounts on it in order to improve the way search engines consider the links between the sites in those accounts. If they share the same IP address those links would be considered as they are coming from the same website. On the other hand, if your websites have different addresses you can make links between them as if they are completely separate ones.
Another potential use of the IP addresses you get is to have SSL certificate for the accounts you have created on the server. A dedicated IP address is a requirement when you install an SSL certificate for any of your websites.
Last but not least, you can change the IP address for an account if it has been blocked by a firewall.
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