Compare observed resolvers with your expected provider
A DNS resolver translates website names into addresses. During this test, unique hostnames cause DNS queries that the measurement service can observe. The result lists the resolver addresses it saw.
Secure DNS settings inside a browser can differ from system or VPN settings. Some providers also use multiple resolver networks. Check unfamiliar addresses against your provider’s own documentation rather than relying on a simple pass/fail label.
This site obtains the observations through its server and discards the local random test ticket after reading the result or after two minutes. The external service has its own operation and retention policy. No DNS measurement is started when this page first loads.