I am not sure I understand your question.
Wikidot is hosted on a server farm.
individual wikis within wikidot do not get individual ip addresses.
You share an IP address with a lot of other people, perhaps all of wikidot.com
You cannot make a domain on wikidot. Your wiki has a sub-domain address like 2012hoax.wikidot.com
If you purchase a domain through a registry, you *can* point it at your wikidot subdomain.
If you pay a small fee, you can get wikidot to redirect everything from your subdomain to your paid domain, so that you can do things like directly reference pages (e.g., http://2012hoax.org/start)