How to get client's MAC Address from browser

Hi Guys,

I was having problem of finding out MAC address from browser. I finally achieved the same by using help from a blog and jQuery. The current code is tested on local LAN and it gives the MAC address based on the local LAN ip address.

Here is how i achieved it





Step 1 :

Create a utility class
using System;
using System.Collections.Generic;
using System.Net;
using System.Runtime.InteropServices;

//Thanks to http://stephenhaunts.com/2014/01/06/getting-the-mac-address-for-a-machine-on-the-network/
namespace MAC
{
    public sealed class NativeMethods
    {
        [DllImport("iphlpapi.dll", ExactSpelling = true)]
        private static extern int SendARP(int DestIP, int SrcIP, byte[] pMacAddr, ref uint PhyAddrLen);

        private NativeMethods() { }

        public static string GetMacAddress(string ipAddress)
        {
            if (string.IsNullOrEmpty(ipAddress))
            {
                throw new ArgumentNullException("ipAddress");
            }

            IPAddress IP = IPAddress.Parse(ipAddress);
            byte[] macAddr = new byte[6];
            uint macAddrLen = (uint)macAddr.Length;

            if (SendARP((int)IP.Address, 0, macAddr, ref macAddrLen) != 0)
            {
                throw new Exception("ARP command failed");
            }

            string[] str = new string[(int)macAddrLen];

            for (int i = 0; i < macAddrLen; i++)
            {
                str[i] = macAddr[i].ToString("x2");
            }

            return string.Join(":", str).ToUpper();
        }
    }
}

Step 2:

Create a default.aspx page and do the following code in c#.
[WebMethod]
        public static string GetMAC(string ip)
        {
            string mac=MAC.NativeMethods.GetMacAddress(ip);
            return mac;
        }

Step 3:

Calling webmethod from browser (client side) to get mac address

<script language="javascript">
        var ip = '<%= Request.UserHostAddress%>';
        $.ajax({
            data: "{'ip':'"+ip+"'}",
            type: "POST",
            dataType: "json",
            contentType: "application/json;charset=utf-8",
            url: "Default.aspx/GetMAC",
            success: function (data) {
                $("#macdiv").html("Your IP is " + ip + " Your MAC Address is <b>" + data.d + "</b>");
            },
            error: function (a, b, c) { alert(a); }
        });
    </script>

That's all folks, Please do give your feedback on the same.

Thanks
Ritesh Tandon