DNS over TLS

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DNS over TLS (DoT) is a security protocol for encrypting and wrapping Domain Name System (DNS) queries and answers via the Transport Layer Security (TLS) protocol. The goal of the method is to increase user privacy and security by preventing eavesdropping and manipulation of DNS data via man-in-the-middle attacks.

As of 2019, Cloudflare, Quad9, Google, Quadrant Information Security and CleanBrowsing are providing public DNS resolver services via DNS over TLS.[1][2][3][4][5] In April 2018, Google announced that Android Pie will include support for DNS over TLS,[6] allowing users to set a DNS server phone-wide on both WiFi and mobile connections, an option that was historically only possible on rooted devices. DNSDist, from PowerDNS also announced support for DNS over TLS in its latest version 1.3.0.[7] BIND users can also provide DNS over TLS by proxying it through stunnel.[8] Unbound supports DNS over TLS since 22 January 2018.[9][10] With Android Pie's support for DNS over TLS, some ad blockers now support using the encrypted protocol as a relatively easy way to access their services versus any of the various work-around methods typically used such as VPNs and proxy servers.[11][12][13]


Many public recursive servers support DoT, but client systems are often required to opt in.

Android clients use DNS over TLS by default.

Linux and Windows users can use DNS over TLS as a client through the NLNetLabs stubby daemon or Knot Resolver[14]. Alternatively they may install getdns-utils[15] to use DoT directly with the getdns_query tool.

systemd-resolved is a Linux-only implementation that must be configured to use DNS over TLS, by editing /etc/systemd/resolved.conf and enabling the DNSOverTLS setting.

See also[edit]


  1. ^ "How to keep your ISP's nose out of your browser history with encrypted DNS". Ars Technica. Retrieved 2018-04-08.
  2. ^ "DNS over TLS - Cloudflare Resolver". developers.cloudflare.com. Retrieved 2018-04-08.
  3. ^ "Google Public DNS now supports DNS-over-TLS". Google Online Security Blog. Retrieved 2019-01-10.
  4. ^ "Quad9, a Public DNS Resolver - with Security". RIPE Labs. Retrieved 2018-04-08.
  5. ^ "Troubleshooting DNS over TLS".[user-generated source]
  6. ^ "DNS over TLS support in Android P Developer Preview". Google Security Blog. April 17, 2018.
  7. ^ "DNS-over-TLS". dnsdist.org. Retrieved 25 April 2018.
  8. ^ "Bind - DNS over TLS".
  9. ^ "Unbound version 1.7.3 Changelog".
  10. ^ Aleksandersen, Daniel. "Actually secure DNS over TLS in Unbound". Ctrl blog. Retrieved 2018-08-07.
  11. ^ "blockerDNS - Block Ads and Online Trackers So You Can Browse the Web Privately on Your Android Phone Without Installing an App!". blockerdns.com. Retrieved 2019-08-14.
  12. ^ "The official release of AdGuard DNS — a new unique approach to privacy-oriented DNS". AdGuard Blog. Retrieved 2019-08-14.
  13. ^ "Blahdns -- Dns service support DoH, DoT, DNSCrypt". blahdns.com. Retrieved 2019-08-14.
  14. ^ "Knot Resolver".
  15. ^ Package: getdns-utils, retrieved 2019-04-04

External links[edit]