<p>I wanted to show the users Name Address (see <a href="http://www.ipchicken.com" rel="nofollow noreferrer">www.ipchicken.com</a>), but the only thing I can find is the IP Address. I tried a reverse lookup, but didn't work either:</p>

<pre><code>IPAddress ip = IPAddress.Parse(this.lblIp.Text);
string hostName = Dns.GetHostByAddress(ip).HostName;
this.lblHost.Text = hostName;
</code></pre>

<p>But HostName is the same as the IP address.</p>

<p>Who know's what I need to do?</p>

<p>Thanks.
Gab.</p>

Not all IP addresses need to have hostnames. I think that's what is happening in your case. Try it ouy with more well-known IP/hostname pairs eg:
Name: google.com Address: 72.14.207.99
Name: google.com Address:
  64.233.187.99
Name: google.com Address:
  64.233.167.99
...I might just be wrong