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Official Description

This application allows you to remotely connect to the web server installed on your local network with dynamic ip.
Just need a arduino ethernet shield and arduino in your installation.
You can try out the service or hire in:
http://excontrol.es/Users/Renovar-conexion-externa.aspx

The code for Arduino can be downloaded at this address.
http://www.excontrol.es/Domotica-Arduino/Descargas/WebServer_Full.rar

You can visit the project page:
http://excontrol.es/Domotica-Arduino/Arduino-WebServer/