How can I get the client REAL IP address in C# ?

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Please help me!

How can I get the client's real IP address in ASP.NET page?

I have tried many ways to try to get this value, but failed.
Here is my tried methods:

C#

Request.UserHostAddress
Request.ServerVariables["HTTP_X_FORWARDED_FOR"]
Request.ServerVariables["REMOTE_ADDR"]

The result is:

C#

UserHostAddress: 16.85.175.133
HTTP_X_FORWARDED_FOR:
REMOTE_ADDR: 16.85.175.133

This is not client IP address, it's Proxy address.

Any solutions to get this value ?

Thank you!

Posted 11-Apr-13 4:37am

Youzelin

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PIEBALDconsult 11-Apr-13 10:51am

Why? The same client's IP address could be different the next time they contact you.

Prasad Khandekar 11-Apr-13 11:09am

In ASP.NET server side alone you won't be able to get it. See this discussion (http://superuser.com/questions/284927/how-to-get-the-real-ip-address-of-someone-using-a-proxy)

snorkie 11-Apr-13 13:33pm

Are you asking for the public/external IP address(es), or the local LAN address(es)?

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Michael Haephrati · Accepted Answer · 2013-04-11T10:10:00

What you mean in the IP address that is seen from outside.
To get this IP address, you must use a service that provide this information manually or programatically (via API).

For example, to use 'http://whatismyip.com' the following code will obtain the IP programatically:

C#

UTF8Encoding utf8 = new UTF8Encoding();
WebClient mywebClient = new WebClient();
String externalIp = utf8.GetString(mywebClient.DownloadData("http://whatismyip.com/automation/n09230945.asp"));

Response.Write("Your External IP Address is: " + externalIp );