How to get my own IP

[Björnke von Gierke]

I was trying to get my IP for a little chat program I wrote, but with 
my code I always get the local IP of my subnet (192.168.1.2) To my 
understanding it is not possible to connect to me if the other Host 
does only know that IP. So is there a bug, is it because I coded this 
wrong, or is that IP sufficient? (www.yanku.net is the URL of a friend 
of mine)

Script:

on mouseUp
   open socket "www.yanku.net:80" with message connected
end mouseup

on connected
   put the hostAddress of "www.yanku.net:80" into field "myIP"
   close socket "www.yanku.net:80"
end connected

thanks in advance
Björnke von Gierke