Материал из .Net Framework эксперт
IPHostEntry.HostName
using System;
using System.Collections.Generic;
using System.Text;
using System.Net;
//DnsLookup
class Program {
static void Main(string[] args) {
IPHostEntry ipHostEntry = Dns.GetHostEntry("www.google.ru");
Console.WriteLine("Host: {0}", ipHostEntry.HostName);
if (ipHostEntry.Aliases.Length > 0) {
Console.WriteLine("\nAliases:");
foreach (string alias in ipHostEntry.Aliases) {
Console.WriteLine(alias);
}
}
Console.WriteLine("\nAddress(es):");
foreach (IPAddress address in ipHostEntry.AddressList) {
Console.WriteLine("Address: {0}", address.ToString());
}
}
}