DNS leak test

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What is a DNS leak?

DNS is used to translate domain names into IP address, eg ovpn.com into 217.64.148.10. A simplification of DNS would be that it's the internet's address book.

Because of its role as that address book, DNS affects nearly everything that you do online since your browser, apps and other software use domain names to find the servers that they rely on.

A DNS leak is when a VPN fails to protect these lookups, even when the rest of your traffic is encrypted and protected by the VPN tunnel. As such, a DNS leak is a significant privacy risk since your device sends information regarding which domain names are requested.

How does OVPN prevent DNS leaks?

By default, your device typically uses a DNS server that is operated by your internet service provider (ISP). However, as soon as you connect to OVPN, your device will start using the log free DNS servers that OVPN operates.

OVPN's desktop client uses several methods to ensure that you're fully protected:

  • Changes the settings of all available network adapters on your device to ensure that OVPN's DNS servers are used
  • Checks the DNS settings on the adapters every second to ensure no installed software attempts to change the used DNS servers
  • Supports DNSCrypt, which prevents DNS spoofing by using cryptographic signatures that verify that responses originate from OVPN's DNS servers

What can cause DNS leakage when using a VPN?

DNS leaks may happen for several reasons - which is why we've integrated DNS leak checks in our desktop client as well as on our dashboard. Here are a few reasons why DNS leaks might occur:

  1. Manual VPN configuration: if you're using the native OpenVPN integrations, there might not be any DNS leak prevention measures included.
  2. Manual DNS setup: if you or software on your device has changed the DNS servers your device uses.

Using OVPN's desktop client removes the vast majority of risks and is highly recommended.

Connected to OVPN but still seeing a leak?

Contact our support and we'll solve that quickly.