Server List for a game

Server List for a game

I'm making a c++ multiplayer game, and I'm trying to implement a server
list, where everyone can host his own server. But I don't know how to
start, I've google'd for a while and I didn't find anything about this. I
tried to search for a master server specially designed to handle with the
server list, so if I refresh it, it will ask the master how many servers
it has, and tell the client the servers' informations, and I don't have
any idea on how I could make it.
Could you just show me an example, or tell me how could I begin?
Any help is really appreciated.