Dns lookup using javascript

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October 11th, 2006, 08:17 AM

Nirbhayanand

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Dns lookup using javascript

Any one can tell me if it is possible to get IP address of a particular site using its name ie-www.rediffmail.com and it will return IP address on client side in javascript.

October 11th, 2006, 09:11 AM

MadCowDzz

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I do'nt think it's possible using Javascript alone.
You might be best using a server side script for that.

Out of curiousity, why would you need to do that?

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October 11th, 2006, 05:34 PM

colton22

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you could you javascript but it may not be the real ip, you could use...

var ip = '';

hope this helped

colton22

Comments on this post

Icon disagrees: I do not think this code does a DNS lookup..

October 12th, 2006, 02:14 AM

Icon

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I guess that would mean breaking out of the sandbox, so it should not be possible. You could go for a server-side script in combination with an ajax call (like MCD said).

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October 13th, 2006, 09:03 PM

colton22

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there is a way to do it in a java applet, but oveously this involves java which some people dont have enabled, i found it on a site when i searched for ip address look up, i couldnt find the code though, only the working model.

colton22

ps i dont know how the code would go, but i do know how i would access the page that contains it.

October 17th, 2006, 01:14 PM

Nilpo

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There are a couple of websites that provide DNS lookup services. I'm not sure if any of them support Java calls though. Perhaps in conjunction with a hidden form, but now you're talking about workarounds.

June 2nd, 2007, 05:01 PM

CINodras

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Some Example Code...

Here are some simple example scripts that will lookup a domain name submitted via an HTML form, using a server sided PHP script.

Name the files as suggested in the comments, and place all three of them in the same directory.

Code:

<html>
<!--
FILENAME: dnslookup.html
This file's name isn't important, however.
-->
<head>
<title>DNS Check</title>
<script language="javascript" src="dnscheck.js"></script>
</head>
<body>
    <table width="0%"  border="0" cellspacing="0" cellpadding="0">
          <tr>
            <td align="right">DOMAIN:</td>
            <td align="left"><input type="text" id="domainTxt" name="domainTxt"></td>
            <td align="left"><span id="output" class="inputFormError"></span></td>
          </tr>
          <tr>
            <td align="center" colspan="2"><input type="submit" id="submitBtn" value="Submit" onclick="dnsCheck('domainTxt','output')"></td>
          </tr>
    </table>
</body>
</html>

Code:

//Javascript DNS Lookup
//FILENAME: dnscheck.js
//06-02-2007
//Eli Moulton

var serverData = false;

if (window.XMLHttpRequest)
{
	serverData = new XMLHttpRequest();
}
else if (window.ActiveXObject)
{
	serverData = new ActiveXObject("Microsoft.XMLHTTP");
}

function dnsCheck(inputId,outputId)
{
	var outputElem = document.getElementById(outputId);
	var inputElem  = document.getElementById(inputId);
	var lookupResults;
	if (serverData)
	{
		serverData.open('GET','dnscheck.php?domain=' + inputElem.value);
		serverData.onreadystatechange = function()
		{
			if (serverData.readyState == 4 && serverData.status == 200)
			{
				lookupResults = serverData.responseText;
				if (lookupResults == -150)
				{
					outputElem.innerHTML = "No Domain Given";
				}
				else if (lookupResults == -100)
				{
					outputElem.innerHTML = "Lookup Failed/Invalid Domain";
				}
				else
				{
					outputElem.innerHTML = "IP: " + lookupResults;
				}
			}
		}
		serverData.send(null);
	}
	else
	{
		outputElem.innerHTML = "Failed To Create XMLHttpRequest Object";
	}
}

Code:

<?php
//DNSCheck server script for use with dnscheck.js
//FILENAME: dnscheck.php
//06-02-2007
//Eli Moulton

if ($_GET['domain'])
{
	$lookupData = dns_get_record($_GET['domain'],DNS_A);
	if ($lookupData)
	{
		echo $lookupData[0]['ip'];
	}
	else
		echo -100;
}
else
{
	echo -150;
}
?>

I hope you find this helpful.

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