title: Get client host name or pc name from ip address
body: <p>With this C# code in ASP.NET, I can get user name that is registered in Active Directory:</p>
  <pre><code> var addlist = Dns.GetHostEntry(Dns.GetHostName());
   string usernameClient= addlist.HostName.ToString();
  </code></pre>
  <p>This code returns the user name like <code>aaaa@aaa.net</code>.</p>
  <p>How is the equivalent of this code in the node js?</p>
  <p>How can get dns name client ?</p>