Signaling That an Authoritative DNS server offers DoT

Document Type Expired Internet-Draft (individual)
Author John Levine 
Last updated 2020-05-20 (latest revision 2019-11-17)
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


DNS resolvers that wish to use DNS over TLS to authoritative servers (ADoT) need some way to tell whether server offers DoT. This document describes some ways that a server might signal that it uses DoT.


John Levine (

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