<div>
for us at our prganization, our intranet IP ranges are: 
 
10.0.0.0 … 10.255.255.255 
172.16.0.0 … 172.31.255.255 
192.168.0.0 .... 
 
So, you will have to put those into consideration. 
 
You have may have to do something like: 
 
If Request.ServerVariables(&quot;REMOTE_ADDR&quot;).ToString.StartsWith(&quot;192.168.0&quot;) 
OR 
Request.ServerVariables(&quot;REMOTE_ADDR&quot;).ToString.StartsWith(&quot;172.16.0.0&quot;) 
OR 
Request.ServerVariables(&quot;REMOTE_ADDR&quot;).ToString.StartsWith(&quot;10.0.0.0&quot;) Then 
 
... 
 

</div>

for us at our prganization, our intranet IP ranges are:

10.0.0.0 … 10.255.255.255
172.16.0.0 … 172.31.255.255
192.168.0.0 ....

So, you will have to put those into consideration.

You have may have to do something like:

If Request.ServerVariables("REMOTE_ADDR").ToString.StartsWith("192.168.0")
OR
Request.ServerVariables("REMOTE_ADDR").ToString.StartsWith("172.16.0.0")
OR
Request.ServerVariables("REMOTE_ADDR").ToString.StartsWith("10.0.0.0") Then

...



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<div class="content wysiwyg-content">
Using: C#, .NetFramework 3.5 and 4, IIS 7 
 
I am trying to determine if the user who is navigating to our site is on our intranet. 
 
Here is what I have, and it works when I test it on my development pc - just not 100% sure this is production ready: 
 
string userTryingToLoginToMyWebApp = Request.UserHostAddress; 
string serverHostingMyWebApp = Request.ServerVariables[&quot;LOCAL_ADDR&quot;]; 
 
if (userTryingToLoginToMyWebApp == serverHostingMyWebApp) { // &quot;intranet user...&quot;; } 
 
Thanks in advance, 
 
Rick
</div>
</div>

Using: C#, .NetFramework 3.5 and 4, IIS 7

I am trying to determine if the user who is navigating to our site is on our intranet.

Here is what I have, and it works when I test it on my development pc - just not 100% sure this is production ready:

string userTryingToLoginToMyWebApp = Request.UserHostAddress;
string serverHostingMyWebApp = Request.ServerVariables["LOCAL_ADDR"];

if (userTryingToLoginToMyWebApp == serverHostingMyWebApp) { // "intranet user..."; }

Thanks in advance,

Rick

How to correctly recognize intranet users from internet users (IIS 7)...

IIS is Internet Information Services, the web server included with Windows Server operating systems. All current versions are built on a modular architecture; modules can be added or removed individually so that those required for specific functionality are installed. The full installation of IIS includes HTTP, security, content, compression, caching, logging and diagnostics.

Microsoft IIS Web Server

Web browsers are applications used primarily to display documents, files and media from the Internet, identified by a Uniform Resource Identifier (URI) that can be a page, image, video or other file. Some browsers require the use of add-ons or extensions to safely render the information they receive; others have systems built into them to perform the same functions.

Web Browsers

Software firewalls, also known as host-based firewalls, provide a layer of software on one host that controls network traffic in and out of that single machine. Most operating systems now include firewall software, but many available software firewalls include central distribution, antivirus systems and disaster recovery.