A DNS leak is when, through a security flaw or software issue, your ISP can track your internet browsing activity, even if you are using a VPN or not.
When using a VPN service, the DNS request should be routed through the VPN provider's DNS servers and not those of your ISP.
Should you want to check for a DNS leak, we suggest reading this article.
If you have any questions, please contact support and we'll be happy to help!
Last reviewed/updated January 2020