title: UserHostAddress gives wrong IPs
body: <p>I collect statistics on IP addresses from where users visit my site and I have noticed what there are only two IP addresses presented, 172.16.16.1 and 172.16.16.248. The property I use to determine IP address is</p>
  
  <pre><code>Request.UserHostAddress
  </code></pre>
  
  <p>What could be a reason of IP address information losing? All the users are from around the world, so they cann't be behind only two proxies.</p>