Online Score!

I upgraded my basic arena program for my Pi, so now it uses an online score! I made this over ftp. Basically, my program will get the score from a file on my computer (and this is with a user with tiny permissions) and then store it in a variable. Then, at the end of the arena game, if the score is higher then the online one, it will upload your score to the ftp server on my computer. This works, but for one thing. I can't seem to get my computer's global IP. That means it will only work for people connected to my network, and I doubt you would go to California to connect to our network. Recently, I had some IP issues and it won't work over my network at all anymore. Mostly cause I tried changing my IP.