Prevent DNS leaks

What is a DNS server?

As soon as you click on a domain (e.g. there is a Domain Name System query – short DNS query. The system is a rather simple one: entries like the name of the domain and the respective IP address are saved on a DNS server. Similar to a telephone book, one number and address belong together. When calling up the DNS server will deliver the matching number. In our example that would be You want to give it a try? Copy the number, paste it into the address bar in your browser, and see what happens.

As soon as you connect to the Internet via your router, you Internet Service Provider’s (ISP) DNS server will be used as your standard DNS server. That means, that the whole “traffic” runs via your ISP’s DNS server. Whenever you call up a new website your computer runs a query via your router. A lot of data that may be used to analyse you or your behaviour develops during this process. This goes as far as the possibility that the list of your browser history or opened apps could accessible and the information visible there could be used without your authorization. This data should not fall into the wrong hands. Still, data abuse and DNS leaks occur repeatedly.

Was ist ein DNS Leak

How do DNS leaks occur?

If your computer sends an unencrypted query to the DNS server and the data is intercepted, e.g. because of a Phishing attack, a DNS leak occurs. Then, the attacker knows which website or service you want to connect with. Because of that you are not anonymous any longer and a profile about your surfing patterns can be created. It can also be the case that the DNS server you are connected to saves your queries. As a new query is created each time you call up a website an exact profile of your surfing patterns can be compiled. No matter which origin a DNS leak has your safety in the Internet and with that your data is in danger.

Was ist ein DNS Leak

How can you solve the problem?

The answer to that questions is easy: you use a VPN service. When using a VPN all your queries are sent via VPN Provider’s DNS server and cannot be traced back to where they came from. SpyOFF does not save any log data and offers perfect safety. Beware - this is not the case for all VPN providers. With SpyOFF there is no documentation or data retention at all. To ensure complete protection all of your devices should be guarded.


How can you determine whether you are affected by a DNS leak?

To determine whether you are affected by a DNS leak click here and conduct a free DNS leak test. Should an IP address from your country or your Internet Service Provider appear your DNS is leaking. You will find step-by-step instructions on how to prevent and solve DNS links here.