How to get a client's ip address with ASP.NET

[Noopur]

I want to fetch client's ip address as soon as he accesses my web-site built in asp.net.Then i want to store it in my database.
Is there any method to achieve this target in asp.net application.
If you could help me i will be very thankful to you.

[Niheel]

ASP .Net web page:

Dim strClientIP As String
strClientIP = Request.UserHostAddress()
Response.Write(strClientIP)
 

ASP .NET web services:

Context.Request.ServerVariables ["REMOTE_ADDR"]
 

[BitBotBob]

or you can try:

string ip;
 
ip=Request.ServerVariables("HTTP_X_FORWARDED_FOR");
if(ip==string.Empty)
{
ip=Request.ServerVariables("REMOTE_ADDR");
}

REMOTE_ADDR does not always provide the users IP but rather the ISPs' IP address so first test HTTP_X_FORWARDE D_FOR as this one is the real user IP.

[chiminh]

This is very helpful for me. Many thanks

[Dorana]

Another important note to this

the HTTP_X_FORWARDE D_FOR may contain an array of IP, this can happen if you connect through a proxy.
What also happens when this happens is that the REMOTE_ADDR may contain the proxy IP.

to avoid this problem you can parse the HTTP_X_FORWARDE D_FOR for the last entery IP.

this can easily be done using...

ip=Request.ServerVariables("HTTP_X_FORWARDED_FOR") ;
if (!string.IsNullOrEmpty(ip))
{
   string[] ipRange = ip.Split(',');
   int le = ipRange.Length - 1;
   string trueIP = ipRange[le];
}
else
{
   ip=Request.ServerVariables("REMOTE_ADDR");
}

This code example is C#.NET but the method is the same

What this does is check if we have anything in the HTTP_X_FORWARDE D_FOR, and if we do we take out the last entry (works if only one entry is found aswell)
if we don't have an HTTP_X_FORWARDE D_FOR we set the IP from the REMOTE_ADDR instead

[YoSoy]

only one thing...Serverv ariables is the NameValueCollec tion type so its items cannot be accesed by doing ServerVariables (ItemName) if C# is used for coding.
Instead please use... ServerVariables[ItemName] that doesn't hurt

[Dorana]

Yes of cause. My misstake.

there were also some concern about the order of the X-FORWARDED-FOR addresses.

My code gets the last entry in the string.
for the first entry simply use

 if (!string.IsNullOrEmpty(ip))
 {
    string[] ipRange = ip.Split(',');
    string trueIP = ipRange[0];
 }

instead of

 if (!string.IsNullOrEmpty(ip))
 {
    string[] ipRange = ip.Split(',');
    int le = ipRange.Length - 1;
    string trueIP = ipRange[le];
 }

[YoSoy]

also remember that those values are a comma+space separated list so you could add string trueIP = ipRange[0].Trim(); in order to avoid spaces in fornt or in the back of your result, but that is just a bit picky from my side... sorry about that

[snehal kadiya]

Hi i m not able to get value of HTTP_X_FORWARDE D_FOR , the value Request.ServerV ariables("HTTP_ X_FORWARDED_FOR ") i get is nothing so kindly guide me

[HacunaMatata]

I test this in my VS2008 and it write "127.0.0.1" ,but I don't know how it will show in a real web site,did I finish it?