Honestly, I am not for sure. I understand what IP address are for, but I'm in the process of switching hosting companies. This domain that I need the IP address changed on will be my main domain that I will host all the other ones under. I have tried the register a DNS function at enom and get the following response:
Not a unique IP address or DNS
The new hosting company says I can register the DNS anytime but I need to change my IP address first. I can't find any place to make the IP changes.