Tomar la dirección IP de un cliente para tratar de individualizarlo es un método muy usado por la mayoría de los programas de Internet. Este método (que funcionó muy bien durante varios años), en el escenario actual de Internet ya no funciona, dando lugar a grandes confusiones. Este documento describe detalladamente las razones de este cambio de escenario, y presenta las soluciones que pueden adoptar los programadores y webmasters para recobrar la exactitud perdida.
I am really afraid LH2 that the system you are using is totally unuseful and dangerous due to the confusion it can generate with false IP identifications. I have found in one hold Computer magazine (2007 ) a nice article about this kind of research and you can read in spanish above.
The summary is: today is absolutely useless to take the IP of a client and use an internet program to identify him/her because this method is completely old and overcome from the new technology. I have the reasons in this articles but I prefer to keep for myself so to don't give any help to this kind of criminals.
Thank you for your cooperation.