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CurrentBEST CURRENT PRACTICEIETF streamBCP91

RFC 10001: Operational Guidelines for DNS Transport in Mixed IPv4/IPv6 Environments

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

This document provides guidelines and documents best current practice for operating authoritative DNS servers, recursive resolvers, and stub resolvers in a mixed IPv4/IPv6 environment. This document recommends that both authoritative DNS servers and recursive resolvers support IPv4 and IPv6. It also provides guidance on how recursive DNS resolvers should select upstream DNS servers, including when IPv4-embedded IPv6 addresses are available. This document obsoletes RFC 3901.

Document record

Document ID
RFC10001
Published
August 2026
Authors
Momoka; T. Fiebig
Status
BEST CURRENT PRACTICE
Stream
IETF
Area
ops
Pages
17
Also known as
BCP91
Obsoletes:
RFC 3901

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The document record above — title, authors, date, status, stream, area, relationships, DOI and errata — is imported verbatim from the public RFC Editor index. The “in plain English” section is editorial: written by The metasystema editorial team, not part of the RFC. Where the two differ, the RFC text governs.

Last checked against the RFC Editor index on . RFCs are never revised after publication; changes are issued as new documents.

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canonical URL: /rfc/10001-operational-guidelines-for-dns-transport-in-mixed-ipv4-ipv6-environments