IIS W3C Log Parser & Analyzer
Instantly parse, dissect, and inspect Internet Information Services (IIS) W3C format log entries into clear, interactive tables.
Ready
| Timestamp | Method | URI Stem | Client IP | Status | Substatus | Win32 Status | Time Taken (ms) |
|---|---|---|---|---|---|---|---|
| Awaiting input... | |||||||
IIS W3C Log Fields Reference
Common Fields
`date`, `time`, `s-ip`, `cs-method`, `cs-uri-stem`, `c-ip`, and `sc-status` capture when and where requests originated and their outcome.
Substatus & Win32 Codes
`sc-substatus` and `sc-win32-status` offer deep diagnostic hints (e.g., IIS sub-error codes like 401.2 or Windows error codes like Access Denied).
Performance Tracking
`time-taken` measures request execution duration in milliseconds, helping isolate slow endpoints or latency bottlenecks.
Frequently Asked Questions (FAQ)
The W3C format is a customizable ASCII-delimited format defined by header directives (`#Fields`), making it easy to add or remove specific request attributes in IIS site logging properties.
Substatus codes pinpoint exact error causes. For example, `401.2` specifically indicates "Unauthorized: Logon failed due to server configuration," helping administrators pinpoint authentication scheme mismatches.