A DNS leak refers to a security flaw that allows DNS requests to be revealed to ISP DNS servers, despite the use of a VPN service to attempt to conceal them. Although primarily of concern to VPN users, it is also possible to prevent it for proxy and direct internet users.

How do I know if my DNS is leaking?

There are easy ways to test for a leak, again using websites like Hidester DNS Leak Test, DNSLeak.com, or DNS Leak Test.com. You'll get results that tell you the IP address and owner of the DNS server you're using. If it's your ISP's server, you've got a DNS leak.

Why is my DNS leaking?

A few potential causes of DNS leaks include: Your network's DNS settings are incorrect or improperly configured. Your ISP may be using transparent DNS proxies. There are issues in your IPv4 to IPv6 transition process.