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IPv4 IPv6 An open DNS recursive service for free security and high privacy Quad9 is a free service that replaces your default ISP or enterprise Domain Name Server DNS configuration. When your computer performs any Internet transaction that uses the DNS and most transactions do Quad9 blocks lookups of malicious host names from an uptotheminute list of threats. This blocking action protects your computer mobile device or IoT systems against a wide range of threats such as malware phishing spyware and botnets and it can improve performance in addition to guaranteeing privacy. The Quad9 DNS service is operated by the Swissbased Quad9 Foundation whose mission is to provide a safer and more robust Internet for everyone.