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transmission/docs/Peer-ID-and-User-Agent.md
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Peer-ID

From version 0.80 onward, Transmission's peer-id is formatted in Azureus' style with one digit for the major version, two digits for the minor version and one character to denote a stable release (0), nightly build (Z) or prerelease beta (X). For example:

  • -TR1330- — Official 1.33 release
  • -TR133Z- — Nightly build between 1.33 and 1.34
  • -TR133X- — Beta release of 1.34

Rationale: This differentiates between official and unofficial releases in a way which is easy for trackers to detect with simple string comparison. An official release (-TR1330-) is lexicographically smaller than its post-release unsupported versions (-TR133Z- and -TR133X-), which in turn are lexicographically smaller than the next official release (-TR1340-).

Before 0.80, versions of Transmission used two digits for the major version and two for the minor version. For example, -TR0072- was Transmission 0.72.

User-Agent

Its User-Agent header follows a similar format, plus the VCS revision in parentheses:

  • Transmission/1.30X (6416) — Beta release leading up to version 1.30
  • Transmission/1.32 (6455) — Official 1.32 release
  • Transmission/1.32+ (6499) — Nightly build between 1.32 and 1.33