Generally, rebuilding an IP address pool isn't needed due to the way that cPanel servers are configured. However, sometimes when you add more IP addresses to your cPanel server, cPanel doesn't update fully and a cPanel IP pool rebuild is required for the new IPs to become available for use. To do this, please follow the below outlined is a way to rebuild the cPanel VPS IP address pool step-by-step:
If rebuilding the IP address pool doesn't resolve the issue, then there might be other factors at work within your cPanel VPS server. You may want to get in contact with our cPanel VPS support team to assist you in getting this issue resolved.
New cPanel versions seems doing this automatically cause we were not using this IP rebuild feature lately on our VPS.Posted by Katia - Tue, Jul 10th, 2012 12:13 PM
This is only needed when the web hosting provider adss more IP addresses for your VPS server.Posted by EltonA - Mon, May 21st, 2012 10:16 AM