For VPS customers, we will accommodate the request at no extra charge if requested within the first 72 hours of ordering your VPS.
Otherwise, if requested at a later time, we will charge $3/IP each time for IP replacement.
You can learn how to change your VPS IP address here: https://blog.racknerd.com/changing-your-vps-primary-ipv4-address-with-racknerd/
Here is a related video tutorial: