Is it possible to make an "internet" chat program?

I have already made a chat program for a LAN, but I want to somehow make it usable over the internet. Is there a way to make the program use your internet ip, instead of your lan ip?

Hello: I gott a similar trouble over writing an internet chat app. I have an app that works on a local server, works with a local database, i want it to work on internet, but i dont know how to do it, i also use a server app for replying client queries. I'm using sockets and i don't know how a client can works throught a LAN - proxy or router internet acces - to the app if i have to place it on a web server

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