RFC 3123 · EXPERIMENTAL · 2001
SUN · 14 JUN 2026
A DNS RR Type for Lists of Address Prefixes
Overview
RFC 3123, “A DNS RR Type for Lists of Address Prefixes”, is an Experimental document published in June 2001 by P. Koch. The canonical text is published by the RFC Editor.
Abstract
The Domain Name System (DNS) is primarily used to translate domain names into IPv4 addresses using A RRs (Resource Records). Several approaches exist to describe networks or address ranges. This document specifies a new DNS RR type "APL" for address prefix lists. This memo defines an Experimental Protocol for the Internet community.
What “Experimental” means
Describes a specification that is part of a research or development effort, published so the community can gain experience with it.
Read this RFC
The canonical text of RFC 3123 is hosted at rfc-editor.org. Available in TXT,HTML.
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