W3C Internationalization Checker

Verifiable

The fetcher behind W3C's Internationalization Checker, which retrieves a user-submitted page and reports on its language, encoding and other i18n markup. W3C's validation services page lists its user agent alongside the single IPv4 address and IPv6 prefix all W3C validators fetch from.

Operated by World Wide Web Consortium (W3C) · Official documentation

User agents

Patterns this directory matches, with real observed strings.

regexW3C_I18n-Checker/[\d.]+
observedW3C_I18n-Checker/1.0

How to verify

Documented static ranges: 52.22.66.203/32, 2600:1f18:7d7a:2700::/56

IP ranges (2)

Refreshed daily from the operator's feed. Also available as /data/ips/w3c-i18n-checker.ips and /data/bots/w3c-i18n-checker.json.

2600:1f18:7d7a:2700::/56
52.22.66.203/32

Good Bot Practices scorecard

Identifies honestly
Stable UA token documented (1 pattern)
Verifiable
Verifiable
Respects robots.txt
Does not honor robots.txt
Behaves
Crawl-rate behavior is operator-declared; not machine-verifiable from this dataset
Reachable operator
Operator and documentation published

Measured against the Good Bot Practices.