DNS Scoped Data Through '_Underscore' Attribute Leaves

Document Type Replaced Internet-Draft (dnsop WG)
Last updated 2016-03-14 (latest revision 2015-11-14)
Replaced by draft-ietf-dnsop-attrleaf
Stream IETF
Intended RFC status Best Current Practice
Expired & archived
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Stream WG state Adopted by a WG
Document shepherd No shepherd assigned
IESG IESG state Replaced by draft-ietf-dnsop-attrleaf
Consensus Boilerplate Yes
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


Historically, any DNS RR may occur for any domain name. Recent additions have defined DNS leaf nodes that contain a reserved node name, beginning with an underscore. The underscore construct is used to define a semantic scope for DNS records that are associated with the parent domain. This specification explores the nature of this DNS usage and defines the "underscore names" registry with IANA.


Dave Crocker (dcrocker@bbiw.net)

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