into its facility and severity, build a priority from auth.crit or local0.info, and see the matching journalctl priority keyword.">
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Syslog Priority Decoder

Turn a syslog priority such as <34> into its facility and severity, or build one from a pair such as auth.crit.

<34>, 34, auth.crit, local0.info, or a full line such as <134>1 2026-11-09T05:00:00Z host app 123 ID47 - started
Common priorities

Severities (0–7)

Facilities (0–23)

A syslog priority is one number from 0 to 191: facility × 8 + severity. RFC 5424 and the older BSD format both put it first in angle brackets, so <34> is facility 4 (auth) and severity 2 (crit). journald stores the severity as PRIORITY and journalctl --priority takes the same keywords shown here. Facility 15 is the solaris-cron slot that RFC 5424 calls a second clock daemon, and every facility can carry any severity. RFC 5424 forbids leading zeros, so <034> is refused rather than silently read as 34. Decoding is a lookup in this page: nothing is executed, stored or sent anywhere.