RFC 9953 - DNS over CoAP (DoC)

• Status: Proposed Standard
• Published: March 2026
• Stream: IETF
• Errata: RFC Editor Errata

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).

Contents

• 1. Introduction
• 2. Terminology and Conventions
• 3. Selection of a DoC Server
• 4. Basic Message Exchange
• 5. Interaction with Other CoAP and CoRE Features
• 6. Considerations for Unprotected Use
• 7. Security Considerations
• 8. IANA Considerations
• 9. Operational Considerations
• 10. References
• Appendix A. Evaluation
• Acknowledgments
• Authors' Addresses

Related Resources

• Official Text: RFC 9953
• Official Page: RFC 9953 DataTracker
• Errata: RFC Editor Errata