Syslog Header and Structured Data Inspector
Inspect one RFC 5424 VERSION 1 message, calendar timestamps and structured data with highlighted syntax diagnostics.
About this syslog header and structured data inspector
Inspect one RFC 5424 VERSION 1 message, calendar timestamps and structured data with highlighted syntax diagnostics Performs protocol inspection, IP calculation, and network analysis client-side without sending probes or exposing network topology.
Protocol mechanics & network logic
Paste one message and inspect its PRI, facility/severity, timestamp, header fields and structured-data parameters. Diagnostics highlight the affected text. Repeated parameter names remain separate. Copy transfers the parsed report. The older multiline shape checker stays below.
Worked network diagnostic scenario
Scenario: Validate one RFC5424-shaped syslog line locally.
Sample input:
Processing: Split the non-empty line by the validator regex, then check PRI, VERSION and timestamp prefix. <34> means facility 4 and severity 2. The sample timestamp 2003-10-11T22:14:15.003Z is valid; exampleSDID@32473 contains iut=3, eventSource=Application and eventID=1011.
Illustrative output:
Addressing limits & protocol boundaries
Both panels require fewer than 2,000,000 UTF-8 bytes. The new inspector checks VERSION 1, header ASCII/lengths, Gregorian calendar/time/offset ranges, uppercase T/Z, 1–6 fractional digits, SD name syntax, duplicate IDs and quoting. Invalid escapes are reported while their text is retained; leap seconds are rejected. Highlight positions use UTF-16 indexes. Message preview is limited to 160 Unicode characters. It does not verify IANA/PEN registration, application semantics, original wire encoding, transport, authenticity or downstream acceptance.
Addressing calculations and subnet models in Syslog Header and Structured Data Inspector follow IETF RFC definitions. Ensure subnet masks and CIDR prefixes match your network topology.
Offline network inspection boundary
Address parsing and CIDR calculations in Syslog Header and Structured Data Inspector run entirely client-side without probing external IP networks or transmitting routing data.
IETF RFC specifications & IANA registries
IETF Request for Comments (RFC) standards and IANA registry references:
Syslog Header and Structured Data Inspector verification · Audit standards
How to use it
- Enter, paste, or select your input data into the Syslog Header and Structured Data Inspector workspace controls.
- Review parameter fields, units, or options configured for Syslog Header and Structured Data Inspector.
- Click the action button or observe immediate live calculations rendered by Syslog Header and Structured Data Inspector.
Frequently asked questions
How does Syslog Message Format Validator (RFC 5424) parse and process input data structures?+
Original shorthand helper: It matches each nonempty line against a shallow RFC 5424-shaped header, extracts PRI, VERSION, timestamp, host/app fields and the structuredData field as raw text, then checks PRI 0–191, VERSION 1 and only a timestamp prefix. It does not parse structured-data parameters or validate a real calendar date or the full RFC 5424 grammar.
Which character sets and payloads are compatible with Syslog Message Format Validator (RFC 5424)?+
Original shorthand helper: The page has one text area, Run locally and Load sample. It emits JSON totals and one detail per non-empty line: regex failures are malformed; regex matches expose header fields and may still be invalid for PRI, VERSION or timestamp checks.
What protective mechanisms ensure Syslog Message Format Validator (RFC 5424) remains stable during edge cases?+
Original shorthand helper: The validator checks each non-empty line against one RFC 5424-shaped regular expression. Matching lines must have PRI from 0 through 191, VERSION exactly 1, and a timestamp that is NILVALUE or merely begins with a YYYY-MM-DDT pattern; it then splits facility and severity and returns header fields. It does not validate real RFC 3339 dates, field lengths, UTF-8, escapes, structured-data identifiers and parameters, BOM, transports, or every RFC 5424 rule.
What result does the worked example produce?+
Original shorthand helper: For the sample RFC 5424-shaped line, the local parser reports one valid entry; malformed text is reported as invalid. This only checks the displayed text and shallow header shape, not syslog transport, server logging or complete RFC 5424 validation.