Once logged in, under 'My Services' select the server you wish to check
You will see the 'Assigned IP addresses' Under 'Service details'
Alternatively, you can view the IP addresses your Control Panel VPS is using, by loging in to WHM for your server, to do this complete the following steps.
In the IP Functions page, click on ‘Show IP Address Usage’
The Show IP Address Usage page will show all the IP addresses assigned to your server, along with any IP addresses assigned to a particular site on the server.