A Web site hosted with a "dedicated IP" never changes location. The advantages of having a dedicated IP number is that dedicated IP's tend to lend themselves much better to advanced web development, they are much easier to work with and they are more compatible with server side applications.

So why don’t all hosting companies offer all their customers a dedicated IP? There are numerous reasons ranging from cost to the availability of IP addresses. In reality this is a hotly debated topic that no one can prove which is better, or in reality; the battle is are dedicated IP’s per website better for the owner of that domain and his web presence then a shared IP environment. This in my opinion, is the real question.