MAC addresses in JavaScript


I know that we can get the MAC address of a user via IE (ActiveX objects).

Is there a way to obtain a user's MAC address using JavaScript?

This question is tagged with javascript mac-address

~ Asked on 2008-08-06 13:43:44

6 Answers


I concur with all the previous answers that it would be a privacy/security vulnerability if you would be able to do this directly from Javascript. There are two things I can think of:

  • Using Java (with a signed applet)
  • Using signed Javascript, which in FF (and Mozilla in general) gets higher privileges than normal JS (but it is fairly complicated to set up)

~ Answered on 2008-08-14 06:21:12


The quick and simple answer is No.

Javascript is quite a high level language and does not have access to this sort of information.

~ Answered on 2008-08-06 13:45:00


No you cannot get the MAC address in JavaScript, mainly because the MAC address uniquely identifies the running computer so it would be a security vulnerability.

Now if all you need is a unique identifier, I suggest you create one yourself using some cryptographic algorithm and store it in a cookie.

If you really need to know the MAC address of the computer AND you are developing for internal applications, then I suggest you use an external component to do that: ActiveX for IE, XPCOM for Firefox (installed as an extension).

~ Answered on 2008-08-11 16:34:49


Nope. The reason ActiveX can do it is because ActiveX is a little application that runs on the client's machine.

I would imagine access to such information via JavaScript would be a security vulnerability.

~ Answered on 2008-08-06 15:38:50


If this is for an intranet application and all of the clients use DHCP, you can query the DHCP server for the MAC address for a given IP address.

~ Answered on 2008-08-06 13:51:52


i was looking for the same problem and stumbled upon the following code.

How to get Client MAC address(Web):

To get the client MAC address only way we can rely on JavaScript and Active X control of Microsoft.It is only work in IE if Active X enable for IE. As the ActiveXObject is not available with the Firefox, its not working with the firefox and is working fine in IE.

This script is for IE only:

function showMacAddress() {_x000D_
    var obj = new ActiveXObject("WbemScripting.SWbemLocator");_x000D_
    var s = obj.ConnectServer(".");_x000D_
    var properties = s.ExecQuery("SELECT * FROM Win32_NetworkAdapterConfiguration");_x000D_
    var e = new Enumerator(properties);_x000D_
    var output;_x000D_
    output = '<table border="0" cellPadding="5px" cellSpacing="1px" bgColor="#CCCCCC">';_x000D_
    output = output + '<tr bgColor="#EAEAEA"><td>Caption</td><td>MACAddress</td></tr>';_x000D_
    while (!e.atEnd()) {_x000D_
        var p = e.item();_x000D_
        if (!p) continue;_x000D_
        output = output + '<tr bgColor="#FFFFFF">';_x000D_
        output = output + '<td>' + p.Caption; +'</td>';_x000D_
        output = output + '<td>' + p.MACAddress + '</td>';_x000D_
        output = output + '</tr>';_x000D_
    output = output + '</table>';_x000D_
    document.getElementById("box").innerHTML = output;_x000D_
<div id='box'></div>

~ Answered on 2018-01-05 11:22:54

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