If you have the MangoES Configuration Module version 1.0.3 or newer installed you can use this network discovery tool to find the IP address of a MangoES connected to your network.
Download MangoES Discovery 1.0.0.zip
Once downloaded unzip the file and double click on the mangoES-Discovery-1.0.0.jar file. You will get a window popup that will display any found MangoES's on your network.