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C# code:

string hostname = "www.csdn.net";
IPAddress[] addresslist = Dns.GetHostAddresses(hostname);

foreach (IPAddress ipaddress in addresslist)
{
Console.WriteLine(ipaddress.ToString());
}



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string hostname = "www.csdn.net";
IPAddress[] addresslist = Dns.GetHostAddresses(hostname);
  foreach (IPAddress ipaddress in ¡­¡­

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string hostname = TextBox1.Text;
  System.Net.IPAddress[] addresslist = System.Net.Dns.GetHostAddresses(hostname);

  foreach (System.Net.IPAddress ipaddress in addresslist)
  {
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