A review of DNS over port 80/443

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Last updated 2017-05-18 (latest revision 2016-11-14)
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


The default DNS transport uses UDP on port 53. There are many motivations why users or operators may prefer to avoid sending DNS traffic in this way. A common solution is to use port 80 or 443; with plain TCP, TLS-encrypted TCP, or full HTTP(S). This memo reviews the possible approaches and delivers some useful information for developers.


Shane Kerr (shane@biigroup.cn)
Linjian Song (songlinjian@gmail.com)
Runxia Wan (rxwan@biigroup.cn)

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)