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Retrieve a Users IP Address

Using ASP or Active Server Pages it is actually quite easy to retrieve a users IP Address.

REMOTE_ADDR and HTTP_X_FORWARDED_FOR are the two server variables we are interested in in order to attempt to capture a users IP address.

Many people simply grab the IP Address like so.

<%
Dim UserIPAddress
UserIPAddress = Request.ServerVariables("REMOTE_ADDR")
%>

This however is a better way to do it.

<%
Dim UserIPAddress
UserIPAddress = Request.ServerVariables("HTTP_X_FORWARDED_FOR")
If UserIPAddress = "" Then
  UserIPAddress = Request.ServerVariables("REMOTE_ADDR")
End If
%>

The reason we look for the HTTP_X_FORWARDED_FOR value 1st is because of proxy servers and things of that nature as many users are behind one. If that value is not there we just grab the

REMOTE_ADDR. Even by doing this there are going to be times when we do not get an IP Address or what we get is not accurate. There really is not anything you can do about that.

Regarding there server variables you can always loop through them as well and show MOST of them which is very helpful when testing.

<table border="1" width="500" style="border-collapse: collapse"> 
<% 
For each item in Request.ServerVariables 
   Response.Write("<tr><td>" & item & "</td><td>") 
   Response.Write(Request.ServerVariables(item)) 
   Response.Write("</td></tr>" & vbCrLf) 
Next 
%> 
</table> 


Your going to see a lot of server information you never knew existed when doing that.
Similar to this below.
  



APPL_MD_PATH
/LM/W3SVC/1/ROOT

APPL_PHYSICAL_PATH
c:\inetpub\wwwroot\

AUTH_PASSWORD
 

AUTH_TYPE
 

AUTH_USER
 

CERT_COOKIE
 

CERT_FLAGS
 

CERT_ISSUER
 

CERT_KEYSIZE
 

CERT_SECRETKEYSIZE
 

CERT_SERIALNUMBER
 

CERT_SERVER_ISSUER
 

CERT_SERVER_SUBJECT
 

CERT_SUBJECT
 

CONTENT_LENGTH
0

CONTENT_TYPE
 

GATEWAY_INTERFACE
CGI/1.1

HTTPS
off

HTTPS_KEYSIZE
 

HTTPS_SECRETKEYSIZE
 

HTTPS_SERVER_ISSUER
 

HTTPS_SERVER_SUBJECT
 

INSTANCE_ID
1

INSTANCE_META_PATH
/LM/W3SVC/1

LOCAL_ADDR
192.168.1.100

LOGON_USER
 

PATH_INFO
/emailform/server.asp

PATH_TRANSLATED
c:\inetpub\wwwroot\emailform\server.asp

QUERY_STRING
 

REMOTE_ADDR
192.168.1.100

REMOTE_HOST
192.168.1.100

REMOTE_USER
 

REQUEST_METHOD
GET

SCRIPT_NAME
/emailform/server.asp

SERVER_NAME
poseidon

SERVER_PORT
80

SERVER_PORT_SECURE
0

SERVER_PROTOCOL
HTTP/1.1

SERVER_SOFTWARE
Microsoft-IIS/5.1

URL
/emailform/server.asp

HTTP_ACCEPT
*/*

HTTP_ACCEPT_LANGUAGE
en-us

HTTP_CONNECTION
Keep-Alive

HTTP_HOST
poseidon

HTTP_USER_AGENT
Mozilla/4.0 (compatible MSIE 6.0 Windows NT 5.1 SV1 .NET CLR 1.1.4322)

HTTP_ACCEPT_ENCODING
gzip, deflate

HTTP_X_REWRITE_URL
/emailform/server.asp

ASP (Active Server Pages) is a technology developed by Microsoft. Pages using ASP are primarily developed in JScript, or VBScript and are integrated into the HTML of your Web pages. The ASP code is compiled on-the-fly by the server and the resulting output is standard HTML. By using ASP, Web pages can be dynamic, full of ever-changing content, and browser independent.