RFC 9872: Recommendations for Discovering IPv6 Prefix Used for IPv6 Address Synthesis

In plain English — editorial summary, not part of the RFC

On networks providing IPv4-IPv6 translation (RFC 7915), hosts and other endpoints need to know the IPv6 prefix(es) used for translation (the NAT64 prefix (RFC 6052)). This document provides guidelines for NAT64 prefix discovery, specifically recommending obtaining the NAT64 prefix from the Router Advertisement option (RFC 8781) when available.

Document record

Document ID

RFC9872

Published

September 2025

Authors

N. Buraglio; T. Jensen; J. Linkova

Status

INFORMATIONAL

Stream

IETF

Area

ops

Pages

10

Also known as

—

• Read the full RFC text →
• Plain text version
• IETF Datatracker history
• DOI: 10.17487/RFC9872

Topics

• IPv6
• DNS64
• PREF64
• NAT64
• CLAT

Related documents

Ranked automatically by shared keywords, IETF area and stream — not by editorial selection.

• RFC 8683Additional Deployment Guidelines for NAT64/464XLAT in Operator and Enterprise NetworksCurrent

  November 2019

• RFC 8880Special Use Domain Name 'ipv4only.arpa'Current

  August 2020

• RFC 9313Pros and Cons of IPv6 Transition Technologies for IPv4-as-a-Service (IPv4aaS)Current

  October 2022

• RFC 8512A YANG Module for Network Address Translation (NAT) and Network Prefix Translation (NPT)Current

  January 2019

• RFC 8305Happy Eyeballs Version 2: Better Connectivity Using ConcurrencyCurrent

  December 2017

• RFC 8219Benchmarking Methodology for IPv6 Transition TechnologiesCurrent

  August 2017

• RFC 7934Host Address Availability RecommendationsCurrent

  July 2016

• RFC 7051Analysis of Solution Proposals for Hosts to Learn NAT64 PrefixCurrent

  November 2013

Also filed under

• INFORMATIONAL
• 2025
• IETF stream
• ops area