Updating the NTP Registries
RFC 9748, “Updating the NTP Registries”, is a Proposed Standard document published in February 2025 by R. Salz. It updates RFC 5905, RFC 5906, RFC 7821, RFC 7822, RFC 8573. The canonical text is published by the RFC Editor.
Abstract
The Network Time Protocol (NTP) and Network Time Security (NTS) documents define a number of registries, collectively called the NTP registries.
Some registries are correct, but some include incorrect assignments and some don't follow common practice. For the sake of completeness, this document reviews all NTP and NTS registries, and corrects the registries where necessary.
This document updates RFCs 5905, 5906, 7821, 7822, and 8573.
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 9748 is hosted at rfc-editor.org. Available in HTML,TXT,PDF,XML.
- RFC 9747 Unaffiliated Bidirectional Forwarding Detection Echo
- RFC 9749 Use of Voluntary Application Server Identification in JSON Meta Application Protocol Web Push
- RFC 9746 BGP EVPN Multihoming Extensions for Split-Horizon Filtering
- RFC 9750 The Messaging Layer Security Architecture
- RFC 9745 The Deprecation HTTP Response Header Field
- RFC 9751 Closing the RTP Payload Format Media Types Registry
- RFC 9744 EVPN Virtual Private Wire Service Flexible Cross-Connect Service
- RFC 9752 Conveying Vendor-Specific Information in the Path Computation Element Communication Protocol Extensions for Stateful PCE