Websites blocking ClaudeBot
Anthropic's primary web crawler, used to collect public web data that can support training of the Claude models.
Operated by Anthropic · Training crawler · operator documentation
5.76%
block ClaudeBot
1.42 million of 24.63 million domains with a known robots.txt policy
2.23%
block it by name
549K domains, the rest inherit a blanket
* block
2.80%
restrict it by name
691K domains name it and close some of its paths
5.97%
name it in robots.txt
1.47 million domains give it rules of their own
Data for Sep 2026. All four percentages
divide by the same 24.63 million domains. Blocked counts both
explicit User-agent: ClaudeBot blocks and blanket
* blocks the crawler inherits.
Blocking trend
2.5%
5%
7.5%
10%
Aug 2026
Sep 2026
Share of domains with a known robots.txt policy
blocking ClaudeBot in each monthly crawl. The denominator moves with each crawl and is
defined in the methodology.
Historical mentions, HTTP Archive
2.5%
5%
7.5%
10%
Jun 2023
Apr 2024
Mar 2025
Dec 2025
Sep 2026
Share of sites in each month's
HTTP Archive crawl whose robots.txt named
ClaudeBot (or a legacy alias of it). This series counts
mentions only (the archive keeps no rule text), comes from a different population than our own
crawl above, and the two are never merged.
High-authority sites blocking ClaudeBot by name
| Domain | OPROpen Page Rank | Blocking since |
|---|---|---|
| linkedin.com | 9.82/10 | Aug 2026 |
| whatsapp.com | 9.52/10 | Oct 2026 |
| cloudfront.net | 9.47/10 | Oct 2026 |
| fbcdn.net | 9.40/10 | Aug 2026 |
| nytimes.com | 9.28/10 | Aug 2026 |
| tumblr.com | 9.27/10 | Aug 2026 |
| yahoo.com | 9.27/10 | Oct 2026 |
| line.me | 9.23/10 | Oct 2026 |
| amazon.co.jp | 9.16/10 | Sep 2026 |
| substack.com | 9.13/10 | Oct 2026 |
| businessinsider.com | 9.11/10 | Oct 2026 |
| cookielaw.org | 9.10/10 | Aug 2026 |
| usatoday.com | 9.08/10 | Sep 2026 |
| mhlw.go.jp | 9.08/10 | Sep 2026 |
| wired.com | 9.07/10 | Oct 2026 |
| bandcamp.com | 9.06/10 | Aug 2026 |
| lnkd.in | 9.05/10 | Aug 2026 |
| ed.gov | 9.05/10 | Sep 2026 |
| pexels.com | 9.03/10 | Aug 2026 |
| pixabay.com | 9.02/10 | Oct 2026 |
| apnews.com | 9.02/10 | Sep 2026 |
| investopedia.com | 9.01/10 | Oct 2026 |
| naver.com | 8.99/10 | Oct 2026 |
| amazon.fr | 8.99/10 | Sep 2026 |
| healthline.com | 8.98/10 | Aug 2026 |
| nhk.or.jp | 8.98/10 | Aug 2026 |
| wa.gov | 8.93/10 | Oct 2026 |
| quora.com | 8.92/10 | Aug 2026 |
| uol.com.br | 8.92/10 | Oct 2026 |
| huffpost.com | 8.91/10 | Aug 2026 |
Sites whose robots.txt names ClaudeBot (or a legacy
alias) with a full block, ranked by Open Page Rank. Sites blocking every crawler with a blanket
* rule are counted above but not listed here. Since dates start at our first
observation of the rule.
Restricting some paths
- medium.com
- reddit.com
- linktr.ee
- statista.com
- npr.org
- jotform.com
- xing.com
- squarespace.com
- mckinsey.com
- go.com
- frontiersin.org
- tripadvisor.com
Also matched via
legacy tokens anthropic-ai, claude-web,
which some sites still use for this crawler.