I went through this wiki page
regarding creating a dedicated server and joining it through clients.
Is there any similar way to do with listen server. I tried with -game alone something like this
"C:\Work\UE 4.11-Substance\Engine\Binaries\Win64\UE4Editor.exe" "C:\Work\Projects\QuickShower_Code\QuickShower.uproject" -game -log -nosteam -ResX=1280 -ResY=960
And I was not able to see any IP address similar to what I saw here
Hi Envenger!
Lovely to hear from you again!
With a listen server I’ve found I can always just do this:
"C:\Program Files (x86)\Epic Games\**4.11**\Engine\Binaries\Win64\UE4Editor.exe" "%CD%\YourGame.uproject" 127.0.0.1 -game -ResX=800 -ResY=700 -WinX=800 -WinY=20 -log
It is only for dedicated that I needed to use method shown above.
Are you finding that using 127.0.0.1 is not working for listen server?
Rama
PS: Anyone: Make sure if you use my script above that you make the engine version match yours 
Hello Rama… Hope you are doing good. Nope it doesn’t seem to be working and its creating another instance of the game.
Hi, I had same issue and found out that adding ?listen after a map name will run the game as listen server.
"..\UE4Editor.exe" "..\YourGame.uproject" YourMap?listen -game -ResX=1200 -ResY=800 -WinX=200 -WinY=200 -log -nosteam -windowed