Leftie DNS Diagnostic

Private DNS (Android 9+)

1. Settings → Network & Internet → Private DNS
2. Select Private DNS provider hostname
3. Enter:
4. Tap Save

iOS / macOS — DNS over HTTPS profile

1. Download a configuration profile or use a third-party app (e.g. DNSCloak)
2. Set DoH URL to:
3. On macOS: System Settings → Network → DNS → add

Firefox — DNS over HTTPS

1. about:preferences → Privacy & Security → DNS over HTTPS
2. Select Max Protection or Increased Protection
3. Choose Custom, enter URL:

Chrome / Edge — Secure DNS

1. Settings → Privacy and security → Security
2. Under Use secure DNS, select With Custom provider
3. Enter:

Linux — systemd-resolved