Am I using opdns?

This page looks up a name that only opdns resolvers answer, from this device, and shows what the resolver saw.

Check againHow to check a setup

Each check looks up a fresh random name under check.opdns.io. The opdns server that answers it keeps what it saw for 60 seconds, in memory, for this page to read; it is never logged. A browser with its own secure DNS setting is checked through that setting, not the system's.