With IPv4 IP addresses dwindling, there are only a few select reasons for having a dedicated IP address. Currently, the primary reason to have a dedicated IP address is for an SSL certificate or for WordPress MultiSite. Any other reason is subject to be rejected.

Examples of non-valid reasons:

  • SEO (Search Engine Optimization)
  • Name Servers (Unless required for a country domain)
  • Mail Servers
  • mySQL Servers

Other reasons may also be rejected.
In addition, if you use your IP for something other than the reason approved for, we reserve the right to reclaim your IP.
If you feel you have a valid reason for requesting a dedicated IP, please contact support.

For more information about IPv4, please see this Wikipedia article.
http://en.wikipedia.org/wiki/IPv4_address_exhaustion