DNS Leaks Explained
A DNS leak exposes every website you visit — even with a VPN active. Learn how to detect and prevent DNS leaks.
In this guide
What Is a DNS Leak
When you visit a website, your device sends a DNS query to convert the domain name to an IP address. A DNS leak occurs when these queries bypass the VPN tunnel and go to your ISP's DNS servers, revealing every site you visit to your ISP.
How CasperVPN Prevents DNS Leaks
CasperVPN routes all DNS queries through our encrypted tunnel to our private DNS servers. We use DNS-over-HTTPS internally and block all DNS traffic outside the tunnel. Every connection is verified for DNS leaks automatically.
How to Test for DNS Leaks
Visit a DNS leak test website while connected to CasperVPN. You should only see CasperVPN DNS servers in the results. If you see your ISP's DNS servers, there may be a configuration issue. Contact our support team for help.
Frequently Asked Questions
Does CasperVPN have DNS leak protection?
Yes. DNS leak protection is enabled by default on all platforms and cannot be accidentally disabled.