NXDOMAIN: There Really Is Nothing Underneath
RFC 8020, “NXDOMAIN: There Really Is Nothing Underneath”, is a Proposed Standard document published in November 2016 by S. Bortzmeyer, S. Huque. It updates RFC 1034, RFC 2308. The canonical text is published by the RFC Editor.
Abstract
This document states clearly that when a DNS resolver receives a response with a response code of NXDOMAIN, it means that the domain name which is thus denied AND ALL THE NAMES UNDER IT do not exist.
This document clarifies RFC 1034 and modifies a portion of RFC 2308: it updates both of them.
What “Proposed Standard” means
An entry-level standards-track specification: stable, peer-reviewed and a solid basis for implementation, though it may still evolve before becoming an Internet Standard.
The canonical text of RFC 8020 is hosted at rfc-editor.org. Available in TXT,HTML.
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