One’s system configures Apache by default to respond to any request on any IP address that one can add to the server. The Reserved IP Address Editor interface allows one to configure Apache to ignore HTTP requests on certain IP addresses and also, the system will not assign those IP addresses to new accounts.
It is to note that in order to reserve an IP address, the IP address must exist on the server from before hand. One can add IP addresses to the server with WHM’s Add a New IP Address interface (WHM >> Home >> IP Functions >> Add a New IP Address).
Apache will not use the IP addresses that is selected by the user.
This feature helps the user in certain ways as reviewed in the article.