How it works
- Hostname — the domain to look up (e.g. example.com).
- Record type — A, AAAA, MX, NS, TXT, etc.
- Transport — DoH (HTTPS) or DoT (TLS on port 853).
- Resolver — which provider runs the lookup (Cloudflare, Google, Quad9, …).
- Compare all resolvers — query all 5 providers at once to check propagation.