How to add a new IP address in Plesk?
A new IP address can be added either via the Plesk interface or a command-line interface directly on the Plesk server. Both methods are described below.
If the IP address has already been added to the network interface by means of operating system tools, to register this IP address in Plesk, go to Tools & Settings > IP Addresses and click Re-read or run the following command in a command-line interface:
# plesk bin ipmanage --reread
To add a new IP address in Plesk on a cloud service, visit this KB article.