The only way to view your public IP addresses is by logging into your Plesk control panel. Once logged in, you can view which IP address a domain is using as it is indicated underneath the domain on the Websites & Domains tab.

You may also view all the IP addresses on the server by going to the "Tools & Settings" tab found on the left-hand side. Then navigate to "IP addresses" found underneath the "Tools & Resources" section. Your IP addresses are then ones found in the "Public IP Address" column, these are the IP addresses that devices over the internet may use to connect to your VPS server. The "IP Address" column indicates your internal Private IP addresses; these CANNOT be used to communicate over the internet and are used internally by the VPS server only.

Here is what an example server's IP addresses page looks like:

WARNING: At no point should you change the IP addresses found here, changing these IP addresses will break your VPS server's ability to host websites.