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

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