RFC 9868 · PROPOSED STANDARD · 2025
SUN · 14 JUN 2026
Transport Options for UDP
Overview
RFC 9868, “Transport Options for UDP”, is a Proposed Standard document published in October 2025 by J. Touch, C. Heard. It updates RFC 768. The canonical text is published by the RFC Editor.
Abstract
Transport protocols are extended through the use of transport header options. This document updates RFC 768 (UDP) by indicating the location, syntax, and semantics for UDP transport layer options within the surplus area after the end of the UDP user data but before the end of the IP datagram.
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.
Read this RFC
The canonical text of RFC 9868 is hosted at rfc-editor.org. Available in HTML,TXT,PDF,XML.
Relationships to other RFCs
Other RFCs from 2025
- RFC 9867 Mixing Preshared Keys in the IKE_INTERMEDIATE and CREATE_CHILD_SA Exchanges of the Internet Key Exchange Protocol Version 2 for Post-Quantum Security
- RFC 9869 Datagram Packetization Layer Path MTU Discovery for UDP Options
- RFC 9866 Root Node Failure Detector : Fast Detection of Border Router Crashes in the Routing Protocol for Low-Power and Lossy Networks
- RFC 9870 Export of UDP Options Information in IP Flow Information Export
- RFC 9865 Cursor-Based Pagination of System of Cross-domain Identity Management Resources
- RFC 9871 BGP Color-Aware Routing
- RFC 9864 Fully-Specified Algorithms for JSON Object Signing and Encryption and CBOR Object Signing and Encryption
- RFC 9872 Recommendations for Discovering IPv6 Prefix Used for IPv6 Address Synthesis