REVERSE DNS - DNS INVERSÉ

public string ReverseDNS(String IP)
{
        System.Net.IPAddress adresseIP = System.Net.IPAddress.Parse(IP)

	try
	{
		System.Net.IPHostEntry GetIpHOST = System.Net.Dns.GetHostByAddress(adresseIP);
		return GetIpHOST.HostName;
	}
	catch
	{
                //Si ca marche pas, on retourne l'adresse IP
		return adresseIP.ToString();
	}
}