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

Noopur · #1 December 27th, 2005, 08:04 AM

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.

KUB365 · #2 December 27th, 2005, 08:12 AM

ASP .Net web page:

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Dim strClientIP As String

strClientIP = Request.UserHostAddress()

Response.Write(strClientIP)

ASP .NET web services:

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Context.Request.ServerVariables ["REMOTE_ADDR"]

BitBotBob · #3 June 10th, 2007, 06:44 AM

or you can try:

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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_FORWARDED_FOR as this one is the real user IP.

chiminh · #4 February 16th, 2009, 03:19 AM

This is very helpful for me. Many thanks

Dorana · #5 June 24th, 2009, 01:40 PM

Another important note to this

the HTTP_X_FORWARDED_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_FORWARDED_FOR for the last entery IP.

this can easily be done using...

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 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_FORWARDED_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_FORWARDED_FOR we set the IP from the REMOTE_ADDR instead

YoSoy · #6 July 7th, 2009, 08:44 PM

only one thing...Servervariables is the NameValueCollection 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 · #7 July 8th, 2009, 07:52 AM

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

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  if (!string.IsNullOrEmpty(ip))

 {

    string[] ipRange = ip.Split(',');

    string trueIP = ipRange[0];

 }

instead of

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  if (!string.IsNullOrEmpty(ip))

 {

    string[] ipRange = ip.Split(',');

    int le = ipRange.Length - 1;

    string trueIP = ipRange[le];

 }

YoSoy · #8 July 8th, 2009, 01:36 PM

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

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