Sites that block anthropic-ai
1,253 of the 30,326 domains we have measured, 4%, disallow anthropic-ai at the site root in robots.txt. anthropic-ai collects content that may be used to train a model.
Every domain here has withheld its content from Anthropic's training crawl. That is a separate decision from appearing in the operator's answers, which is governed by a different token.
1,253 of 30,326 measured domains (4%) disallow anthropic-ai at the site root in robots.txt. Every domain named on this page was fetched directly and its robots.txt parsed against RFC 9309; none of it is inferred from a third-party index.
Measured 2026-08-25 by direct request to every domain in the corpus. Method: how this is measured. Reuse under CC BY 4.0 with attribution.
Cite as: Crawl Census, "Sites that block anthropic-ai", measured 2026-08-25. https://crawlcensus.com/blocked/anthropic-ai
The list 1,253 domains
Rank is the domain's position in the popularity list used to seed the corpus; a dash means it was scanned on request rather than seeded. Score is the site's overall AI access score, which blocking depresses but does not by itself determine.
Check a specific domain
See also the anthropic-ai reference, the full census, and the JSON endpoint.