Get IP with JSONP
http://jsonip.appspot.com/?callback=getipjson
Get geo data with JSONP
http://www.geoplugin.net/json.gp?jsoncallback=getgeojson
Get geo data with JavaScript
http://www.geoplugin.net/javascript.gp
Get Place from Lat/Lon with JSONP
Get Nearby Places from Lat/Lon with JSONP
Get Postal Code from Lat/Lon with JSONP
Hostip.info