perform a DNS query

using System;
using System.Net;
class GetDnsInfo
{
public static void Main(string[] argv)
{
if (argv.Length != 1)
{
Console.WriteLine("Usage: GetDnsInfo hostname");
return;
}
IPHostEntry results = Dns.GetHostByName(argv[0]);
Console.WriteLine("Host name: {0}",
results.HostName);
foreach(string alias in results.Aliases)
{
Console.WriteLine("Alias: {0}", alias);
}
foreach(IPAddress address in results.AddressList)
{
Console.WriteLine("Address: {0}",
address.ToString());
}
}
}

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