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DNS4EU vs Quad9: catalog facts
DNS4EU	Quad9
Free Free public service for individuals, with separate offerings for institutions and…	Free The public resolvers are free to use.
Windows, macOS, Linux, Android, iOS	Windows, macOS, Linux, Android, iOS
No software or agent to install, only a DNS address to set Resolution runs on EU infrastructure under EU rules	Malicious domain blocking with no configuration and no account Non-profit, Swiss-based, with a published no-client-IP-logging policy
Filtering is fixed per variant, with no custom block lists for individuals Relies on trusting a third-party resolver with your queries	Blocking is security-focused only; it does not block advertising No per-device customisation on the free public resolvers
Hosted service	Hosted service
Closed source	Closed source
License not stated	License not stated
No account needed	Not stated if an account is needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 22, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.