Free DNS tools
Make sense of your DNS setup.
Check a connection, set up a device, or work through a problem. Start with the question you have right now.
Ad & tracker connection test
Check a small sample of advertising and analytics connections, then learn what the results can tell you.
DNS setup assistant
Get setup, verification, and recovery steps for your device using your blocker’s actual local IP address.
DNS troubleshooting guide
Work through a connection problem one step at a time, from ads that remain to a website that no longer opens.
Before you start
One device. One change at a time.
Use the device and network you want to check. Keep your original DNS settings so you can restore them after testing.
A browser connection test can show whether a request gets through. To check the DNS filter itself, follow the controlled lookup in our DNS testing guide.
All three tools are free. No account required.