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Client Subnet in DNS Queries (RFC7871) Disclosure Number: IPCOM000246743D
Original Publication Date: 2016-May-01
Included in the Prior Art Database: 2016-Jun-29
Document File: 60 page(s) / 68K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

C. Contavalli: AUTHOR [+3]


Many Authoritative Nameservers today return different responses based on the perceived topological location of the user. These servers use the IP address of the incoming query to identify that location.

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Internet Engineering Task Force (IETF)                     C. Contavalli Request for Comments: 7871                              W. van der Gaast Category: Informational                                           Google ISSN: 2070-1721                                              D. Lawrence                                                      Akamai Technologies                                                                W. Kumari                                                                   Google                                                                 May 2016

                       Client Subnet in DNS Queries


   This document describes an Extension Mechanisms for DNS (EDNS0)    option that is in active use to carry information about the network    that originated a DNS query and the network for which the subsequent    response can be cached.  Since it has some known operational and    privacy shortcomings, a revision will be worked through the IETF for    improvement.

Status of This Memo

   This document is not an Internet Standards Track specification; it is    published for informational purposes.

   This document is a product of the Internet Engineering Task Force    (IETF).  It represents the consensus of the IETF community.  It has    received public review and has been approved for publication by the    Internet Engineering Steering Group (IESG).  Not all documents    approved by the IESG are a candidate for any level of Internet    Standard; see Section 2 of RFC 5741.

   Information about the current status of this document, any errata,    and how to provide feedback on it may be obtained at

Contavalli, et al.            Informational                     [Page 1]
 RFC 7871              Client Subnet in DNS Queries              May 2016

 Copyright Notice

   Copyright (c) 2016 IETF Trust and the persons identified as the    document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal    Provisions Relating to IETF Documents    ( in effect on the date of    publication of this document.  Please review these documents    carefully, as they describe your rights and restrictions with respect    to this document.  Code Components extracted from this document must    include Simplified BSD License text as described in Section 4.e of    the Trust Legal Provisio...