How to retrieve the TRUE IP address in ASP
 

Request.ServerVariables("REMOTE_ADDR") can be used to retrieve the IP address of the client machine.

While clients connect internet via a proxy server, the above method only return the IP address of the proxy server, other than the REAL IP address of the client machine. In order to request the TRUE IP address of the client via the proxy server, you may use
Request.ServerVariables("HTTP_X_FORWARDED_FOR").

One more thing, if the client does not connect the internet via a proxy server, then Request.ServerVariables ("HTTP_X_FORWARDED_FOR") will return a null value. Therefore, you can use this method in your program like this:

i.e. If client connect the internet via a proxy server, we take the value returned by

HTTP_X_FORWARDED_FOR, otherwise we take the value returned by REMOTE_ADDR

Re: How to retrieve the TRUE IP address in ASP
 

Thankx

Re: How to retrieve the TRUE IP address in ASP
 

is any problem in Request.UserHostAddress.ToString()

Re: How to retrieve the TRUE IP address in ASP
 

hi sorry iam new, where should i put all that?
thanks a lot

Re: How to retrieve the TRUE IP address in ASP
 

What's your objective?

Re: How to retrieve the TRUE IP address in ASP
 

Thats a good point. If it is going to retreive the original IP, why do people use all these proxy sites to hide their traces? So, if we are going to use the SERVER VARIABLE specified by you, we will be knowing there true IPs, isin't it? Or is there a different way these proxy sites work?

Re: How to retrieve the TRUE IP address in ASP
 

There are two types of proxies transparent and anonymous, transparent server sends over the original IP, where anonymous hides the original IP, the above code will only work for a transparent proxy!

Re: How to retrieve the TRUE IP address in ASP
 

Ok thanks, that clears up things. As a suggestion, it would be good to add this info about transparent and anonymous proxies in your original message.

Re: How to retrieve the TRUE IP address in ASP
 

Hi pradeep,

Can you help me to suggest how to use anonymous proxies. how to implement such proxies in asp.net application.

Thanks in advance.

Jitesh
programmer

Re: How to retrieve the TRUE IP address in ASP
 

This tutorial covers on fetching the exact client IP address. Here the author explains that using Request.ServerVariables("REMOTE_ADDR") can only bring the IP address of the proxy server. So the author finally decided to use...