Client Subnet in DNS Requests

The information below is for an old version of the document
Document Type Expired Internet-Draft (dnsop WG)
Authors Carlo Contavalli  , Wilmer van der Gaast  , David Lawrence  , Warren Kumari 
Last updated 2015-05-19 (latest revision 2014-11-15)
Replaces draft-vandergaast-edns-client-subnet
Stream Internet Engineering Task Force (IETF)
Expired & archived
pdf htmlized bibtex
Additional Resources
- Mailing list discussion
Stream WG state WG Document
Document shepherd No shepherd assigned
IESG IESG state Expired
Consensus Boilerplate Unknown
Telechat date
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This draft defines an EDNS0 extension to carry information about the network that originated a DNS query, and the network for which the subsequent reply can be cached. IESG Note [RFC Editor: Please remove this note prior to publication ] This informational document describes an existing, implemented and deployed system. A subset of the operators using this is at . The authors believe that it is better to document this system (even if not everyone agrees with the concept) than leave it undocumented and proprietary.


Carlo Contavalli (
Wilmer van der Gaast (
David Lawrence (
Warren Kumari (

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