Bot intelligence record

W3 Validator Services

Review first

Use the W3C-checklink identifier to separate World Wide Web Consortium (W3C) scraping, SEO, or data-collection traffic from normal visitor requests in server logs.

Scraper Scraping Verified Bot Confidence: Medium Verified: Yes robots.txt: No

User-Agent Pattern

World Wide Web Consortium (W3C)
W3C-checklink

Robots.txt Snippet

Copy-ready 
User-agent: W3C-checklink Disallow: /

Handling Guidance

Depends

Use this record as bot intelligence, then verify the request source and behavior before allowing, blocking, or rate limiting.

Public web data collection, SEO analysis, content extraction, or third-party crawling activity.

Record Details

Structured data
Operator
World Wide Web Consortium (W3C)
Type
Scraper
Purpose
Scraping
Identity type
Verified Bot
Confidence
Medium
Last verified
2026-04-01
Last checked
2026-05-20
Source type
Verified Directory
Spoofing risk
User-agent strings can be spoofed. For allow-listing or low-friction rules, pair the published identifier with operator documentation or cryptographic verification when available.

Notes

W3 Validator Services is listed in the Botcrawl directory as a crawler used for scraping, SEO analysis, or data collection from World Wide Web Consortium (W3C). The primary identifier for log review is W3C-checklink.

Identification

  • User-agent pattern: W3C-checklink
  • Family: World Wide Web Consortium (W3C)
  • Type: Scraper
  • Kind: Crawler

Common use

Public web data collection, SEO analysis, content extraction, or third-party crawling activity.

Verification and handling

Confirm the user-agent against server logs and use published operator documentation, IP ranges, reverse DNS, or other trust signals when available.

Directory guidance marks the risk level as Neutral and the blocking decision as Depends. Do not rely on the user-agent string alone because user-agent strings can be copied or spoofed.

Robots.txt handling: No.

Evidence and Source

  • Validate the identifying user-agent or signature against the operator documentation before creating hard allow rules.
  • Match `W3C-checklink` as a case-insensitive substring in HTTP user-agent logs. Do not treat a user-agent match alone as proof of identity for allow-listing.
  • Public web data collection, SEO analysis, content extraction, or third-party crawling activity.
  • User-agent strings can be spoofed. For allow-listing or low-friction rules, pair the published identifier with operator documentation or cryptographic verification when available.

https://validator.w3.org/services

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