MAC addresses in JavaScript

Question

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

User · Answer

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:

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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_
        e.moveNext();_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_
    }_x000D_
    output = output + '</table>';_x000D_
    document.getElementById("box").innerHTML = output;_x000D_
}_x000D_
_x000D_
showMacAddress();

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<div id='box'></div>

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User · Answer

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

User · Answer

The quick and simple answer is No   Javascript is quite a high level language and does not have access to this sort of information

User · Answer

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

User · Answer

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

User · Answer

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

[javascript] MAC addresses in JavaScript

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