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In my web application i have registration form, when user register i want to get his ip address of his system, how can i get using asp.net. help me please.

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3 Answers 3

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9 
HttpContext.Current.Request.UserHostAddress;

or 

HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];

To get the IP address of the machine and not the proxy use the following code

HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
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2 Comments

@Lance: Good point. More info on that here: en.wikipedia.org/wiki/X-Forwarded-For
than u Mr.Lance Harper it is working but what is the sencond one and third one it is not working
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HttpContext.Current.Request.UserHostAddress

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Do note that for IIS7, Request.UserHostAddress for localhost returns ::1 and not 127.0.0.1.
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Try:

Request.ServerVariables["REMOTE_ADDR"].ToString()
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