Converting domain names to IP addresses

Submitted by planetsourcecode on Tue, 06/09/2009 - 13:03

In ASP.NET, we can easily convert the Domain names to its related IP address like if a website like planetsourcecode.in has a domain name i.e planetsourcecode.com, It has also a corresponding Internet Protocol Address like 208.111.14.112. this can be easily done in ASP.NET using C# Steps for doing this: 1). First we have to include the namespace for this class


Using System.net;

2). Second include two textbox,one command button and Label as below 1--> txtDomain, textbox, to enter the domain names 2--> txtIPs, textbox, to get the desired IP address 3--> btnSubmit, button 4--> lblStatus,Label, for successful result 3). Double click on the command buttton and write the following in cod behind


DNSLookup(txtDomain.Text);

4). and write a method to do this work


protected void DNSLookup(string domain)
{
try
{
//performs the DNS lookup
IPHostEntry he = Dns.GetHostByName(domain);
IPAddress[] ip_addrs = he.AddressList;
txtIPs.Text = "";
foreach (IPAddress ip in ip_addrs)
{
txtIPs.Text += ip + "\n";
}
}
catch (System.Exception ex)
{
lblStatus.Text = ex.ToString();
}
}

Default.aspx %@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

Domain Name:
IP Address(es)

Default.aspx.cs


using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Net;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
    }
    protected void btnSubmit_Click(object sender, EventArgs e)
    {
        DNSLookup(txtDomain.Text);
    }
    protected void DNSLookup(string domain)
    {
        try
        {
            //performs the DNS lookup
            IPHostEntry he = Dns.GetHostByName(domain);
            IPAddress[] ip_addrs = he.AddressList;
            txtIPs.Text = "";
            foreach (IPAddress ip in ip_addrs)
            {
                txtIPs.Text += ip + "\n";
            }
        }
        catch (System.Exception ex)
        {
            lblStatus.Text = ex.ToString();
        }
    }
}

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