Gives back your public IP address in plain HTML, plain text, and JSON (w/CORS!)
JavaScript
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README.md

It's http://ipcalf.com!!!

I really have no idea either, but it's like the other animals only more minimal. IP Minanimal if you will, as a dot com.

Oh and also it does content negotiation!

Use it in shell scripts:

echo `curl -s http://ipcalf.com/?format=text`

Or in JavaScripts:

fermata.json("http://ipcalf.com/").get(function (e,d) { console.log("Yay pointless cross-origin request:", d); })

Or in LISP:

(ok (i dont actually know) lisp)

Bonus

Go to net.ipcalf.com in a WebRTC-capable browser to see your local network IP address.

License (MIT)

Copyright (c) 2012–013 Nathan Vander Wilt

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.