Host via IP Adresse ermitteln

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    /// <summary>
    /// Resolves the host name from the given IP address.
    /// </summary>
    /// <param name="IPAddress">The ip address for getting the host name.</param>
    /// <returns>The host name if exists else "no entry"</returns>
    public static String GetHostNameByIp(String IPAddress)
    {
      System.Net.IPHostEntry Host = null;

      try
      {
        System.Net.IPAddress IP;
        if (System.Net.IPAddress.TryParse(IPAddress, out IP))
          Host = System.Net.Dns.GetHostEntry(IP);
      }
      catch
      {
      }

      return Host.IsNull() ? "No entry" : Host.HostName;
    }