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

http://myexternalip.com provides this kind of information. To retrieve your IP you have plenty of options:

• http://myexternalip.com/ - browser + lot's of examples of how to use it
• http://myexternalip.com/raw - a pure text answer, only your ip, no other crap
• http://myexternalip.com/json - a resposnse ready for json-parsers, also supports jsonp
• HEAD http://myexternalip.com - send only a HEAD-request and get the answer