How to prevent DNS leaks


Last updated: 15 April 2021

This guide explains how to keep yourself safe from DNS leaks. For a more general overview, read about why DNS servers are important from a privacy perspective.

Firefox users  Please note the section below pertaining to you.

Instructions to prevent DNS leaks

If you are using the Mullvad VPN app, you are automatically safe from DNS leaks.

If you’re using DNS over HTTPS (DoH) or DNS over TLS (DoT), the app can’t prevent DNS leaks. As an option, we’ve released a public DNS service that offers DoH and DoT. Try it yourself: Mullvad VPN’s public DNS service.

Firefox users

You are at risk of leaking DNS requests to Cloudflare, no matter which Mullvad setup you have. To prevent this, open Firefox Options > General > Network settings > Settings, then deselect “Enable DNS over HTTPS.”

You can then visit our Connection check to easily check whether or not you’re leaking information.