The app has no Dock icon and no menubar icon so to quit it you'd need to do one of the following:
killall 'IsThereNet'
That IP was chosen for multiple reasons:
8.8.8.8
doesping
or the browser, we decided to make an app that would do that more efficiently for us.~/Library/Containers/com.lowtechguys.IsThereNet/Data/Library/Caches/IsThereNet.log