Use an alternative DNS service

This mini tutorial starts by using OpenDNS, and then the DNS service of Google.


More details about OpenDNS?

That Wikipédia page gives more information about that free (but questionable) service.

This (French) blog post is quite aggressive against OpenDNS, with quite valid arguments. As an extremely short sum-up, you should not use OpenDNS.

To start using OpenDNS, you just need to specify these addresses as additional DNS servers.

For IPv4:,,,

For IPv6:

2620:0:ccc::2, 2620:0:ccd::2

More details on the procedure needed to start using an alternative DNS provider can be found here (thanks to An other tutorial explaining precisely here (for Windows 7).

Check your settings

To check that you use indeed the OpenDNS servers, you just need to go on that web-page

Or you can test this from the command line (with the dig command):

You can also check how the OpenDNS servers protect you against fishing and « bad » Internet web-sites, by going to the (safe) web-page (the DNS request to OpenDNS required to know where to look up the page will be interpreted as dangerous, and so you will be redirected to that « nicer » page).

Voir aussi

In order to know your IP address (v4 or v6).

In order to know your Internet Service Provider (ISP).

In order to check if your ISP is not doing any DNS leaks behind your back.

Hidester’s DNS Leak Test

Another tool of this kind (, quoted here because the author asked me to include a link here…

Pixel Privacy’s DNS Leak Test

I’ve been kindly asked to add a link to this test (

Why this rather empty page on my web-site?

Mainly because I wanted to have one easy-to-find web-page where to quickly find the IPv4 (and IPv6) addresses of the OpenDNS (and Google DNS) servers, in order to be able to quickly copy/paste them when I configure a new Wi-Fi (or Ethernet) connexion on my personal laptop.

Now it’s done!

An other alternative DNS provider?

Google also offers a free, non-restrictive, and open-to-anyone DNS service:

For IPv4:,

For IPv6:

2001:4860:4860::8888, 2001:4860:4860::8844

Or you can test this from the command line (with the dig command):


More information?

As always, more details can be found here on Wikipédia, or on the official web-page on

Google DNS is supposed to be quicker and more efficient, but we do not really care in fact (except if you are on a really quick network, the DNS requests velocity cannot be the limiting bottleneck for your web browsing).

But that free service is supposed to not modify the domain names space, contrarily to other services of that kind; and it is known to be quite safe.


Safe? Hum, really…?

It seems legit to assume that all the main DNS services are spied by governmental agencies… Or private agencies, or activist groups or… by Batman? Anyway, keep this in mind: when you use an external DNS service, you cannot be sure of their neutrality and security. By default, you should probably assume that every DNS request your laptop/smartphone makes can simply be read by your government. Reassuring, right?

Two other alternative DNS providers?

Recently, CloudFare also offers a free, non-restrictive, and open-to-anyone DNS service:

For IPv4:, (even easier to remember!)

For IPv6:

2606:4700:4700::1111, 2606:4700:4700::1001

And Quad9 also offers its own DNS.

For IPv4:


Our Linuxian friends can also use a resolv.conf, and for example that one on can help, or by following these explanations. Some extra explanations are also here on or here on, or as always on Wikipédia (yes, I like Wikipédia!).