Just a hint when changing IP Addresses for a live domain.
Change the settings of your nameservers first with your registrar. (NS and NS2, Etc.)
Then change your IP address in your hosting control panel such as Plesk.
By changing IP address assignments this way, I have found that propagation turns out to be much quicker than the expected 24 hours. Many of mine I have seen change almost instantly. If I change it first in the hosting panel, it turns out to take much longer for propagation.