How do I find out what my external IP address is?

Question

My computers are sitting behind a router/firewall. How do I programmatically find out what my external IP address is. I can use http://www.whatsmyip.org/ for ad-hoc queries,

Answer 1

Unfortunately there is no easy way to do it.

I would use a site like www.whatsmyip.org and parse the output.

checkip.dyndns.com returns a very simple HTML file which looks like this:

  
    
  
  
    Current IP Address: 84.151.156.163
  

This should be very easy to parse. Moreover the site is exists for about ten years. There is hope that it will be around for a while.