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Align about, protocol, CAPS, auth token, enumerations, and VATSIM auth pages with current wire behavior, openfsd notes, and clearer structure.
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VATSIM FSD Protocol Documentation
Updated July 2026
FSD is an application-layer TCP/IP protocol facilitating real-time communications between clients connected to the VATSIM network (and private FSD servers that speak the same dialect).
This documentation is reverse-engineered and empirical. It is not an official VATSIM specification. Claims that are not confirmed on the wire or in known client/server behavior are marked as such (e.g. unconfirmed, unknown, or TODO).
See openfsd for a free and open-source FSD server implementation.
Key topics
| Topic | Doc |
|---|---|
| Introduction / framing | about.md |
| Packet reference | protocol.md |
Client/server CAPS |
capabilities.md |
| Enumerations | enumerations.md |
| FSD JWT login tokens | authentication-token.md |
In-band client authenticity ($ZC/$ZR) |
vatsim-auth.md |
This documentation is an independent work and is not affiliated with, endorsed by, or associated with VATSIM, Inc.