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Reverse DNS Naming Convention for CIDR Address Blocks

Document Type Expired Internet-Draft (individual)
Expired & archived
Authors Joe Gersch , Dan Massey , Eric Osterweil , Cathie Olschanowsky
Last updated 2013-08-29 (Latest revision 2013-02-25)
RFC stream (None)
Intended RFC status (None)
Stream Stream state (No stream defined)
Consensus boilerplate Unknown
RFC Editor Note (None)
IESG IESG state Expired
Telechat date (None)
Responsible AD (None)
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:


This draft proposes a naming convention for encoding CIDR address blocks into the reverse DNS namespace. The reverse DNS naming method is commonly used to specify a complete IP address. This document describes how to encode an IPv4 or IPv6 CIDR address block such as By defining a common naming convention, one can associate information with a prefix. The convention builds on past work in RFC 1101 that associates network names with prefixes. However, this previous work pre-dated the introduction of CIDR and has several critical ambiguities. This convention corrects the ambiguities and enables new applications ranging from routing information to geolocation.


Joe Gersch
Dan Massey
Eric Osterweil
Cathie Olschanowsky

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