Get IP Address from DNS Hostname in C#

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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This article was originally written on 11/25/06 Tagged with: Programming

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Comments (5)

1. December 6, 2007 1:18 pm
   Robert

   How might I go about getting other DNS records, such as NS records, or MX records in C#?

2. March 26, 2008 7:40 am
   Ba Than Tin

   How can I know which ip address for which network interface? And if I want IPV4 address only how can I do?

3. January 19, 2009 2:03 am
   vinh

   thanks for your info.

4. July 22, 2009 9:51 am
   biosys

   thanks for info works perfect!

5. September 17, 2009 4:44 am
   Narendra

   how can i print all the systems address connected in a network through window application in c# vs 2008