Anthropic . tier 1
ClaudeBot
Collects training data for Anthropic models.
434 of the 3,618 sites we measured deny ClaudeBot access to their root, which is 12.0% of the index.
How to allow or block it
A group naming the token wins outright over the wildcard group. It does not inherit from it, so rules set under User-agent: * do not carry over.
# Allow ClaudeBot everywhere
User-agent: ClaudeBot
Disallow:
# Block ClaudeBot entirely
User-agent: ClaudeBot
Disallow: /Sites blocking ClaudeBot
Most-visited first. Showing up to 100 of 434.
| Rank | Domain | Score | Answer-surface crawlers | Stack |
|---|---|---|---|---|
| 11 | instagram.com | Score 14 out of 100, grade F, partial assessment | 11 blocked | unidentified |
| 12 | mail.ru | Score 6 out of 100, grade F, partial assessment | 11 blocked | unidentified |
| 15 | twitter.com | Score 14 out of 100, grade F, partial assessment | 11 blocked | unidentified |
| 17 | linkedin.com | Score 17 out of 100, grade F, partial assessment | 9 blocked | unidentified |
| 25 | amazon.com | Score 16 out of 100, grade F, partial assessment | 10 blocked | Akamai |
| 49 | x.com | Score 14 out of 100, grade F, partial assessment | 11 blocked | unidentified |
| 54 | tiktok.com | Score 15 out of 100, grade F | 11 blocked | unidentified |
| 56 | pinterest.com | Score 17 out of 100, grade F, partial assessment | 11 blocked | unidentified |
| 59 | yahoo.comrefused GPTBot | Score 47 out of 100, grade D | 5 blocked | Next.js |
| 71 | myfritz.net | Score 14 out of 100, grade F, partial assessment | 11 blocked | unidentified |
| 76 | chatgpt.com | Score 14 out of 100, grade F, partial assessment | 11 blocked | unidentified |
| 87 | baidu.com | Score 6 out of 100, grade F, partial assessment | 11 blocked | unidentified |
| 88 | vimeo.com | Score 56 out of 100, grade D | 3 blocked | Next.js . Cloudflare |
| 109 | reddit.com | Score 6 out of 100, grade F, partial assessment | 11 blocked | unidentified |
| 129 | snapchat.com | Score 46 out of 100, grade D | 5 blocked | Next.js . Google Cloud / GFE |
| 159 | nytimes.comrefused GPTBot | Score 21 out of 100, grade F, partial assessment | 11 blocked | Fastly |
| 161 | tumblr.com | Score 41 out of 100, grade D | 4 blocked | WordPress |
| 189 | soundcloud.com | Score 42 out of 100, grade D, partial assessment | 8 blocked | Amazon CloudFront |
| 190 | flickr.com | Score 42 out of 100, grade D, partial assessment | 6 blocked | unidentified |
| 202 | medium.comrefused GPTBot | Score 46 out of 100, grade D | 4 blocked | Cloudflare |
| 204 | cnn.com | Score 31 out of 100, grade F | 10 blocked | Fastly |
| 205 | theguardian.com | Score 46 out of 100, grade D | 6 blocked | unidentified |
| 206 | ebay.com | Score 60 out of 100, grade C, partial assessment | 5 blocked | Akamai |
| 210 | t-online.de | Score 55 out of 100, grade D | 5 blocked | Next.js . Amazon CloudFront |
| 218 | bbc.com | Score 34 out of 100, grade F | 9 blocked | Next.js . Fastly |
| 219 | forbes.com | Score 57 out of 100, grade D, partial assessment | 5 blocked | Next.js . Fastly |
| 236 | bbc.co.uk | Score 37 out of 100, grade F | 9 blocked | Fastly |
| 246 | canva.comrefused GPTBot | Score 66 out of 100, grade C, partial assessment | 4 blocked | Cloudflare |
| 249 | meraki.com | Score 8 out of 100, grade F, partial assessment | 11 blocked | unidentified |
| 268 | imdb.com | Score 9 out of 100, grade F, partial assessment | 11 blocked | unidentified |
| 277 | launchpad.netrefused GPTBot | Score 20 out of 100, grade F | 9 blocked | unidentified |
| 287 | reuters.com | Score 26 out of 100, grade F, partial assessment | 9 blocked | unidentified |
| 304 | nature.com | Score 45 out of 100, grade D, partial assessment | 7 blocked | Fastly |
| 307 | weibo.com | Score 18 out of 100, grade F, partial assessment | 11 blocked | unidentified |
| 335 | amazon.co.uk | Score 16 out of 100, grade F, partial assessment | 10 blocked | Amazon CloudFront |
| 353 | naver.com | Score 6 out of 100, grade F, partial assessment | 11 blocked | unidentified |
| 379 | bloomberg.comrefused GPTBot | Score 27 out of 100, grade F, partial assessment | 10 blocked | Fastly |
| 380 | wsj.com | Score 31 out of 100, grade F, partial assessment | 8 blocked | unidentified |
| 391 | amazon.de | Score 16 out of 100, grade F, partial assessment | 10 blocked | Amazon CloudFront |
| 459 | gcdn.co | Score 6 out of 100, grade F, partial assessment | 11 blocked | unidentified |
| 460 | businessinsider.com | Score 65 out of 100, grade C | 1 blocked | WordPress . Fastly |
| 462 | edgecdn.ru | Score 6 out of 100, grade F, partial assessment | 11 blocked | unidentified |
| 464 | pixabay.comrefused GPTBot | Score 67 out of 100, grade C, partial assessment | 4 blocked | Cloudflare |
| 467 | aol.com | Score 44 out of 100, grade D | 5 blocked | Next.js . Amazon CloudFront |
| 477 | sohu.com | Score 8 out of 100, grade F, partial assessment | 11 blocked | unidentified |
| 483 | amazon.co.za | Score 16 out of 100, grade F, partial assessment | 10 blocked | Akamai |
| 485 | cnbc.comrefused GPTBot | Score 30 out of 100, grade F | 9 blocked | Akamai |
| 487 | statista.comrefused GPTBot | Score 43 out of 100, grade D | 7 blocked | Amazon CloudFront |
| 488 | skybridge.click | Score 6 out of 100, grade F, partial assessment | 11 blocked | unidentified |
| 495 | amazon.co.jp | Score 16 out of 100, grade F, partial assessment | 10 blocked | Akamai |
| 499 | quora.com | Score 13 out of 100, grade F, partial assessment | 10 blocked | unidentified |
| 514 | behance.net | Score 60 out of 100, grade C, partial assessment | 5 blocked | Fastly |
| 536 | ft.comrefused GPTBot | Score 53 out of 100, grade D, partial assessment | 6 blocked | Cloudflare |
| 554 | wired.com | Score 51 out of 100, grade D | 8 blocked | Cloudflare |
| 561 | uol.com.br | Score 47 out of 100, grade D | 8 blocked | Amazon CloudFront |
| 586 | usatoday.com | Score 24 out of 100, grade F | 11 blocked | unidentified |
| 589 | tripadvisor.comrefused GPTBot | Score 63 out of 100, grade C, partial assessment | 4 blocked | Amazon CloudFront |
| 600 | imgsmail.ru | Score 6 out of 100, grade F, partial assessment | 11 blocked | unidentified |
| 617 | threads.com | Score 14 out of 100, grade F, partial assessment | 11 blocked | unidentified |
| 621 | telegraph.co.uk | Score 37 out of 100, grade F | 10 blocked | Adobe Experience Manager . Fastly |
| 623 | nintendo.com | Score 58 out of 100, grade D | 5 blocked | Next.js . Fastly |
| 626 | amazon.fr | Score 16 out of 100, grade F, partial assessment | 10 blocked | Amazon CloudFront |
| 633 | unesco.org | Score 68 out of 100, grade C | 4 blocked | Drupal |
| 637 | sharethrough.com | Score 14 out of 100, grade F, partial assessment | 11 blocked | unidentified |
| 647 | amazon.ca | Score 22 out of 100, grade F | 10 blocked | Amazon CloudFront |
| 656 | techcrunch.com | Score 61 out of 100, grade C | 5 blocked | WordPress |
| 664 | yelp.com | Score 6 out of 100, grade F, partial assessment | 11 blocked | unidentified |
| 668 | hstgr.net | Score 6 out of 100, grade F, partial assessment | 11 blocked | unidentified |
| 672 | elpais.com | Score 54 out of 100, grade D | 5 blocked | unidentified |
| 687 | hihonorcloud.com | Score 6 out of 100, grade F, partial assessment | 11 blocked | unidentified |
| 690 | amazon.in | Score 16 out of 100, grade F, partial assessment | 10 blocked | Amazon CloudFront |
| 692 | dailymail.co.ukrefused GPTBot | Score 26 out of 100, grade F | 11 blocked | Akamai |
| 698 | vkontakte.ru | Score 6 out of 100, grade F, partial assessment | 11 blocked | unidentified |
| 707 | lemonde.fr | Score 49 out of 100, grade D | 5 blocked | Fastly |
| 708 | dailymail.comrefused GPTBot | Score 26 out of 100, grade F | 11 blocked | Akamai |
| 717 | fb.com | Score 6 out of 100, grade F, partial assessment | 11 blocked | unidentified |
| 720 | amazon.es | Score 16 out of 100, grade F, partial assessment | 10 blocked | Amazon CloudFront |
| 721 | pinimg.com | Score 17 out of 100, grade F, partial assessment | 11 blocked | unidentified |
| 725 | amazon.it | Score 16 out of 100, grade F, partial assessment | 10 blocked | Amazon CloudFront |
| 730 | quantserve.com | Score 6 out of 100, grade F, partial assessment | 11 blocked | unidentified |
| 732 | cnet.com | Score 44 out of 100, grade D | 10 blocked | WordPress |
| 737 | globalsign.com | Score 56 out of 100, grade D | 5 blocked | Cloudflare |
| 741 | creativecdn.com | Score 6 out of 100, grade F, partial assessment | 11 blocked | unidentified |
| 743 | bandcamp.com | Score 46 out of 100, grade D | 4 blocked | Fastly |
| 801 | ted.com | Score 46 out of 100, grade D | 5 blocked | Next.js . Fastly |
| 805 | apnews.comrefused GPTBot | Score 54 out of 100, grade D, partial assessment | 6 blocked | Cloudflare |
| 811 | people.com | Score 37 out of 100, grade F, partial assessment | 8 blocked | Cloudflare |
| 817 | adform.net | Score 6 out of 100, grade F, partial assessment | 11 blocked | unidentified |
| 836 | academia.edu | Score 48 out of 100, grade D, partial assessment | 6 blocked | unidentified |
| 837 | lefigaro.fr | Score 55 out of 100, grade D | 7 blocked | unidentified |
| 843 | daum.net | Score 6 out of 100, grade F, partial assessment | 11 blocked | unidentified |
| 849 | amazon.com.au | Score 15 out of 100, grade F | 10 blocked | Amazon CloudFront |
| 853 | theverge.com | Score 44 out of 100, grade D | 9 blocked | WordPress . Fastly |
| 860 | ebay.de | Score 60 out of 100, grade C, partial assessment | 5 blocked | Akamai |
| 862 | amazon.com.br | Score 16 out of 100, grade F, partial assessment | 10 blocked | Akamai |
| 863 | pexels.comrefused GPTBot | Score 61 out of 100, grade C, partial assessment | 5 blocked | Cloudflare |
| 864 | ebay.co.uk | Score 60 out of 100, grade C, partial assessment | 5 blocked | Akamai |
| 868 | figma.com | Score 48 out of 100, grade D | 8 blocked | Sanity . Amazon CloudFront |
| 890 | nbcnews.com | Score 30 out of 100, grade F | 11 blocked | Next.js . Akamai |
| 892 | mercadolivre.com.brrefused GPTBot | Score 42 out of 100, grade D | 6 blocked | Amazon CloudFront |
Using these figures
Free to reuse in research, journalism or a product under CC BY 4.0, with credit to Fidget Labs BV. Quote the measurement date so the claim stays checkable as the index moves.
CrawlIndex by Fidget Labs BV. "Sites blocking ClaudeBot." https://crawlindex.org (measured 2026-09-22). Licensed CC BY 4.0.