Windows DNS Switcher - Switch your DNS resolvers for all network interfaces in Windows from command line.

README.md

Windows DNS Switcher

Changing DNS server addresses in Windows is quite a pain in the a**. This little script tries to help this a bit.

How to use

• Copy the DNS-Switcher.jse file anywhere you like (can be somewhere in the D: drive if you don't want to lose it after the next format)
• Preferably make a shortcut of it in the quick launch, desktop, or your choice of shortcut container
• Right click the file and choose "Open in the command line" or something like it
• Choose from the list
• To cancel while the script is running, press Ctrl + C

Modification

• You can add new servers to the array at the top. They will be available in the next run.
• You can modify any part under the terms of GPL licence, but please contribute it back here.

DNS-Switcher.jse

/**
 * Windows DNS Switcher - Don't wear out your mouse trying to change your DNS server adresses.
 * @author Halil Ozgur
 * @license GPL Licence
*/

var dnsler = [
    ["Empty (DHCP-Auto)",   []],
    ["OpenDNS",             ["208.67.222.222", "208.67.220.220"]],
    ["Google DNS",          ["8.8.8.8", "8.8.4.4"]],
    ["Comodo Secure DNS",   ["156.154.70.22", "156.154.71.22"]]
];

var Regkey = "HKLM\\SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters\\Interfaces\\";
var strComputer = ".";
var objWMIService = GetObject("winmgmts:\\\\" + strComputer + "\\root\\cimv2");
var WshShell = WScript.CreateObject("WScript.Shell")
var IPDevSet = objWMIService.ExecQuery("Select * from Win32_NetworkAdapterConfiguration where IPEnabled=TRUE");

function dnsLblAra(aDnsler)
{
    for (var i = 0; i < dnsler.length; i++) {
        if (aDnsler.join(', ') == dnsler[i][1].join(', ')) {
            return dnsler[i][0];
        }
    }
    return "";
}

function dnsFmt(aDnsler)
{
    var ret = aDnsler.join(', ');
    var dnsLbl = dnsLblAra(aDnsler);
    if (dnsLbl != "") {
        if (aDnsler.length == 0) {
            ret += dnsLbl;
        } else {
            ret += " (" + dnsLbl + ")";
        }
    } else {
        ret += "";
    }
    return ret;
}

function getItemDns(oItem)
{
    if (oItem.DNSServerSearchOrder != null) {
        return oItem.DNSServerSearchOrder.toArray();
    } else {
        return [];
    }
}

WScript.Echo("Current DNS Servers :\n");
for (var enumerator = new Enumerator(IPDevSet); !enumerator.atEnd(); enumerator.moveNext()) {
    var item = enumerator.item();
    WScript.Echo(item.Caption + " :\n" + dnsFmt(getItemDns(item)) + "\n");
}

WScript.Echo("Please choose the new DNS server(s):");

var secim = null;
while (secim == null) {
    for (var i = 0; i < dnsler.length; i++) {
        WScript.Echo(i + " : " + dnsler[i][0]);
    }
    WScript.StdOut.Write(" > ");
    secim = WScript.StdIn.ReadLine();
    secim = parseInt(secim);
    if (!dnsler[secim]) {
        WScript.Echo("Invalid choice. Please try again.\n");
        secim = null;
    }
}

var secilenDNSler = dnsler[secim][1];

for (var enumerator = new Enumerator(IPDevSet) ; !enumerator.atEnd(); enumerator.moveNext()) {
    var item = enumerator.item();
    eskiDNSler = getItemDns(item);
    var kod = item.SetDNSServerSearchOrder(Array(secilenDNSler[0], secilenDNSler[1]));
    WScript.Echo(item.Caption + " :\n[" + kod + '] ' + dnsFmt(eskiDNSler) + " -> " + dnsFmt(secilenDNSler) + "\n");
}

WshShell.Exec("ipconfig /flushdns");
WScript.Echo("\"ipconfig /flushdns\" executed.");
WScript.Sleep(3750);