static void Main(string[] args)
{
    System.Net.IPHostEntry iPHostEntry = System.Net.Dns.GetHostEntry("www.chicai.group");
    System.Net.IPAddress[] address = iPHostEntry.AddressList;
    Console.WriteLine(address[0].ToString());

    Console.WriteLine(System.Net.Dns.GetHostAddresses("www.chicai.group")[0]);

    Console.ReadKey();
}