Get IP Address from DNS Hostname in C#

May 01, 2024

A frequent task when designing applications that work with TCP/IP and the internet is to lookup an IP address from a hostname. It's much easier for users to deal with the hostname than having to type in an IP address. First you'll add the System.Net namespace to your using section:

using System.Net;

Example of code to get address from hostname:

string howtogeek = "www.howtogeek.com"; IPAddress[] addresslist = Dns.GetHostAddresses(howtogeek);
 foreach (IPAddress theaddress in addresslist)
 {
  Console.WriteLine(theaddress.ToString());
 }

This was tested in C# 2.0.

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