How to get IP Address of Visitor's Machine in ASP.Net
Author:Mudassar Khan
Many times there’s a query to get the IP Address of the client machine from which the user visited the website. Hence I decided to post this snippet.
The following snippet gets the IP address of the machine from which the client visited the website.
C#
string ipaddress;
ipaddress = Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
if (ipaddress == "" || ipaddress == null)
ipaddress = Request.ServerVariables["REMOTE_ADDR"];
VB.Net
Dim ipaddress As String
ipaddress = Request.ServerVariables("HTTP_X_FORWARDED_FOR")
If ipaddress = "" Or ipaddress Is Nothing Then
ipaddress = Request.ServerVariables("REMOTE_ADDR")
End If
When users are behind any proxies or routers the REMOTE_ADDR returns the IP Address of the router and not the client user’s machine. Hence first we need to check HTTP_X_FORWARDED_FOR, since when client user is behind a proxy server his machine’s IP Address the Proxy Server’s IP Address is appended to the client machine’s IP Address. If there are multiple proxy servers the IP Addresses of all of them are appended to the client machine IP Address.
Hence we need to first check
HTTP_X_FORWARDED_FOR and then
REMOTE_ADDR.
Note: While running this application on your machine it will show IP Address 127.0.0.1 since your client and server is the same machine. So no need to worry deploy it on server you’ll see the results
You can download the sample source here.
IpAddress.zip (2.59 kb)