Earlier quoted context omitted.
You could also use: http://www.whatismyip.com/automation/n09230945.asp
What a convenient URL to remember.
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Your IP. In JSON
71–72 of 72 posts
Re: Your IP. In JSON
#72if you need geolocation information through javascript, you can use maxmind's free one: http://j.maxmind.com/app/geoip.js
Outputting javascript code instead of something parseable (json probably) seems like a very bad idea. Are you really willing to eval code from a site outside your control? A simple line-by-line regex loop should be enough to parse this though.
This, I think:
http://en.wikipedia.org/wiki/JSON#JSONP
Under the same origin policy, a web page served from server1.example.com cannot normally connect to or communicate with a server other than server1.example.com. An exception is the HTML element.