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Geekpedia » C# Tutorials » Get the IP of a host

Get the IP of a host

Getting the IP address and host name of a host / webhost using System.Net.

On Tuesday, June 15th 2004 at 11:14 AM

By Andrew Pociu (View Profile)

(Rated 4.5 with 11 votes)

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The following code asks you for a host and then returns the IP address of that host. The code is self-explanatory thanks to the comments.

using System;

// using the System.Net namespace

using System.Net;

class Class1

{

[STAThread]

static void Main(string[] args)

{

// Request the name

Console.Write("Please type the name of the host: ");

// Store it in 'host'

string host = Console.ReadLine();

try

{

// Get the DNS information

IPHostEntry ipHost = Dns.GetHostByName(host);

// Display the host name

Console.WriteLine("Host name: {0}", ipHost.HostName);

// Store the list of IP adresses

IPAddress[] ipAddr = ipHost.AddressList;

// Loop to actually display the IP

for(int x = 0; x < ipAddr.Length; x++)

{

Console.WriteLine("IP address: {0}", ipAddr[x].ToString());

}

}

// Catch the exception (if host was not found)

catch(System.Net.Sockets.SocketException)

{

Console.WriteLine("Host not found.");

}

}

}

Here is an example result:

Please type the name of the host: www.geekpedia.com

Host name: geekpedia.com

IP address: 65.75.151.74

Press any key to continue

Also if you want to return the hostname of an IP use Dns.Resolve() instead of Dns.GetHostByName.

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Current Comments

by Andy Jump on Thursday, July 8th 2004 at 05:06 AM

ther reverse can be done very easily too by just exchanging the

Dns.GetHostByName(host);

for

Dns.GetHostByAddress(IP);

this will only work if the dns entry has a reverse lookup though.

by ali on Monday, April 18th 2005 at 06:01 PM

i want information about code get ip header in c#

by Attila Turóczy on Saturday, July 22nd 2006 at 12:36 AM

Perfect tutorial!!

by herumi on Thursday, December 13th 2007 at 05:28 AM

Why the application close automatically before I see the result???
Thanks for share this tutorial???

by on Thursday, January 3rd 2008 at 01:43 PM

"Why the application close automatically before I see the result???
Thanks for share this tutorial???"

Because it has finished it's job. Add Console.Readline after "try".

by Rosen Rusev on Tuesday, January 8th 2008 at 11:10 AM

Simple but effective!