Language: C++ (mvfst-based)
Organization: Meta
Maintainer: alan-frindell, Joseph Beshay
GitHub: facebookexperimental/moxygen
Relay endpoint: fb.mvfst.net
Overview
Meta’s open-source C++ MOQ implementation built on their mvfst QUIC library. Includes relay, client, and protocol library. OpenMOQ maintains a fork (openmoq/moxygen) as a buffer repo for their planned moqx server.
Draft Support
- Draft 14 and 16 supported
- Can negotiate draft 15
- qmux support on port 9449
Public Infrastructure
- QUIC relay:
moqt://fb.mvfst.net:9448/https://fb.mvfst.net:9448/moq-relay - QMux relay:
fb.mvfst.net:9449(TLS/TCP and QUIC) - WebSocket proxy:
wss://fb.mvfst.net:9450(proxying to TLS on 9449)
Notable
- alan-frindell achieved 0-RTT subscribe with draft-16 + unidirectional control streams (2026-03-16)
- Frequently used as the “reference relay” for interop testing
Related
- moq-rs - Alternative relay implementation
- interop-endpoints - Full endpoint listing