Is it possible to see on going games and player list without UNET service ?

Hi,

I wonder if there is a way to see the ongoing games and player list from a lobby in anyway without using Unet services.

Lets say i host my games on a dedicated server with ip 21.21.12.12.
A player launch the game, how can he sees the ongoing games ?
Is there a way to check 21.21.12.12, in anyway ?

thanks