Service Registration Protocol for DNS-Based Service Discovery
RFC 9665, “Service Registration Protocol for DNS-Based Service Discovery”, is a Proposed Standard document published in June 2025 by T. Lemon, S. Cheshire. The canonical text is published by the RFC Editor.
Abstract
The Service Registration Protocol (SRP) for DNS-based Service Discovery (DNS-SD) uses the standard DNS Update mechanism to enable DNS-SD using only unicast packets. This makes it possible to deploy DNS-SD without multicast, which greatly improves scalability and improves performance on networks where multicast service is not an optimal choice, particularly IEEE 802.11 (Wi-Fi) and IEEE 802.15.4 networks. DNS-SD Service registration uses public keys and SIG(0) to allow services to defend their registrations.
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 9665 is hosted at rfc-editor.org. Available in HTML,TXT,PDF,XML.
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