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A public recursive name server is a name server service that networked computers may use to query the Domain Name System , the decentralized Internet naming system, in place of name servers operated by the local Internet service provider to which the devices are connected. Reasons for using these services include:

Public DNS resolver operators often cite increased privacy as an advantage of their services; critics of public DNS services have cited the possibility of mass data collection targeted at the public resolvers as a potential risk of using these services. Several services now support secure DNS lookup transport services such as DNS over HTTPS and DNS over TLS.

Public DNS resolvers are operated either by commercial companies, offering their service for free use to the public, or by private enthusiasts to help spread new technologies and support non-profit communities.

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