Software Title: Paessler Local IP Lister
Download Link: http://www.paessler.com/download/iplister
Contact Them: http://www.paessler.com/company/contact
License: Freeware, Free small tool to use.
A quick way to check your installed local IPs is using this small tool. It lists all installed IPs available on your local PC.
All these IPs can be used for the internal webservers of PRTG Network Monitor.