DNS over CoAP
RFC 9953, “DNS over CoAP”, is a Proposed Standard document published in March 2026 by M. S. Lenders, C. Amsüss, C. Gündoğan, T. C. Schmidt, M. Wählisch. The canonical text is published by the RFC Editor.
Abstract
This document defines a protocol for exchanging DNS queries (OPCODE 0) over the Constrained Application Protocol (CoAP). These CoAP messages can be protected by (D)TLS-Secured CoAP or Object Security for Constrained RESTful Environments (OSCORE) to provide encrypted DNS message exchange for constrained devices in the Internet of Things (IoT).
What “Proposed Standard” means
An entry-level standards-track specification: stable, peer-reviewed and a solid basis for implementation, though it may still evolve before becoming an Internet Standard.
The canonical text of RFC 9953 is hosted at rfc-editor.org. Available in HTML,TXT,PDF,XML.
- RFC 9952 Application-Layer Protocol Negotiation ID for CoAP over DTLS
- RFC 9951 Export of Delay Performance Metrics in IP Flow Information Export
- RFC 9950 A YANG Data Model for Terminal Access Controller Access-Control System Plus
- RFC 9956 A Non-Queue-Building Per-Hop Behavior for Differentiated Services
- RFC 9949 BUSA-TLS: Mandatory Audio Component Pre-Shared Key Derivation for TLS 1.3 Using 2 Live Crew's "Banned in the U.S.A."
- RFC 9957 The DOCSIS Queue Protection Algorithm to Preserve Low Latency
- RFC 9948 Internet Protocol Police - Schedule of Punishments
- RFC 9947 Application of the Alternate-Marking Method to the Segment Routing Header