title: How I can know the Domain for an IP by PHP?
body: <p>How I can know the Domain for an IP by PHP?</p>
  
  <p>I have used this code</p>
  
  <pre><code>&lt;?php
    $hostname = gethostbyaddr($_SERVER['REMOTE_ADDR']);
    echo $hostname;
  ?&gt;
  </code></pre>
  
  <p>But it doesn't work correctly.  For example:</p>
  
  <pre><code>gethostbyaddr(62.75.138.253);
  </code></pre>
  
  <p>domain name is earthwar.de but the correctly answer is german-proxy.de</p>
  
  <p>Please help.</p>