How can i get IP address of client machine in C#.? I want to keep a log register for my online application and to keep IP address of logging system i want to get the IP address of client....
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1How is the client connecting? What is hosting the server? ASP.NET? WCF? Sometime else? – blowdart Dec 29 '10 at 05:19
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1possible duplicate http://stackoverflow.com/questions/735350/how-to-get-users-client-ip-address-in-asp-net – The Scrum Meister Dec 29 '10 at 05:22
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String clientIP =
(HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"]==null)?
HttpContext.Current.Request.UserHostAddress:
HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
Chandu
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1As Wikipedia [notes](http://en.wikipedia.org/wiki/X-Forwarded-For), the value of this header may be bogus. Thus, it's safer to keep a whitelist of IPs for which you trust it. – Matthew Flaschen Dec 29 '10 at 05:32
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3String clientIP = HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"]?? HttpContext.Current.Request.UserHostAddress is this not more readable? +1 one for proxy checking – naveen Dec 29 '10 at 05:38
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Indeed it is more readable, but I was not sure of .Net version OP is using. – Chandu Dec 29 '10 at 05:41
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HttpContext.Current.Request.UserHostAddress
This doesn't attempt to take into account proxies. For that, you can use Request.ServerVariables["HTTP_X_FORWARDED_FOR"]. However, make sure you're not trusting that blindly, since it could be forged. It's better to keep a whitelist of IPs for which you trust it.
Matthew Flaschen
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It wont work. It returns 127.0.0.1 .My systen is in a network. I want the actual IP address of Client system – Nithesh Narayanan Dec 29 '10 at 07:02
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2@Nithesh, it's working. That *is* the IP that actually connected to the server. This means your server is on `localhost` – Matthew Flaschen Dec 29 '10 at 07:06