Claude-User: share of top websites blocking it

On 26 October 2026, 7.2% of the readable top 10k websites fully blocked Claude-User in robots.txt (bounds 5.7% to 25.9% over all 8,220 websites, 1,659 of them unreadable); 3.9% blocked it partly and 5.7% named it.

Last verified 2026-10-26 21:13 UTC (daily run of 2026-10-26). Proof for that day.

Operator
Anthropic
What it is
AI Assistants
Description
Claude-User is dispatched by Anthropic's Claude AI assistant in response to user prompts, when it needs to fetch content to include in its answers. More info can be found at https://knownagents.com/agents/claude-user
robots.txt token
User-agent: Claude-User
Listed since
2026-10-26 (in this ledger's registry)

Fully blocks

7.2%

471 sites; bounds 5.7% to 25.9%

Partly blocks

3.9%

254 sites

Name it explicitly

5.7%

373 sites; unreadable: 3,439

Over time

Share of panel sites blocking Claude-User4 lines, 2016-09-05 to 2026-10-26; values between 2.39 and 7.18 %; latest 7.18 %.2.013.404.796.177.56Sep 2016Mar 2019Sep 2021Apr 2024Oct 2026blocks, reconstructed (Common Crawl): 2016-09-05 UTC: 3.14 %blocks, reconstructed (Common Crawl): 2017-09-25 UTC: 3.51 %blocks, reconstructed (Common Crawl): 2018-09-24 UTC: 3.61 %blocks, reconstructed (Common Crawl): 2019-09-23 UTC: 2.80 %blocks, reconstructed (Common Crawl): 2020-09-28 UTC: 2.52 %blocks, reconstructed (Common Crawl): 2021-09-27 UTC: 2.61 %blocks, reconstructed (Common Crawl): 2022-10-03 UTC: 2.55 %blocks, reconstructed (Common Crawl): 2024-09-16 UTC: 2.39 %blocks, reconstructed (Common Crawl): 2026-09-21 UTC: 4.51 %partly blocks, reconstructed (Common Crawl): 2016-09-05 UTC: 5.04 %partly blocks, reconstructed (Common Crawl): 2017-09-25 UTC: 4.91 %partly blocks, reconstructed (Common Crawl): 2018-09-24 UTC: 4.82 %partly blocks, reconstructed (Common Crawl): 2019-09-23 UTC: 4.76 %partly blocks, reconstructed (Common Crawl): 2020-09-28 UTC: 4.82 %partly blocks, reconstructed (Common Crawl): 2021-09-27 UTC: 4.98 %partly blocks, reconstructed (Common Crawl): 2022-10-03 UTC: 4.91 %partly blocks, reconstructed (Common Crawl): 2024-09-16 UTC: 5.10 %partly blocks, reconstructed (Common Crawl): 2026-09-21 UTC: 5.32 %blocks, daily observation: 2026-10-26 UTC: 7.18 %partly blocks, daily observation: 2026-10-26 UTC: 3.87 %

"Partly blocks" counts every robots.txt whose rules for Claude-User disallow some paths, including generic rules for all crawlers (for example /search); it is not a measure of targeted AI policy. Shares are of the readable websites (W − U: 8,220 websites, 1,659 unreadable); the bounds assume none / all of the unreadable sites block. Solid: daily first-party observations (top 10k of the Tranco list W3ZV9, one fixed cohort). Dashed: reconstructed from Common Crawl (top 10k, sites readable in every crawl), a separate series.

Reconstructed values per crawl
CrawlDateBlocksSites read
CC-MAIN-2016-362016-09-053.1%3,216
CC-MAIN-2017-392017-09-253.5%3,216
CC-MAIN-2018-392018-09-243.6%3,216
CC-MAIN-2019-392019-09-232.8%3,216
CC-MAIN-2020-402020-09-282.5%3,216
CC-MAIN-2021-392021-09-272.6%3,216
CC-MAIN-2022-402022-10-032.5%3,216
CC-MAIN-2024-382024-09-162.4%3,216
CC-MAIN-2026-392026-09-214.5%3,216

Recent blockers

Sites that started fully blocking Claude-User since 2026-07-28, highest-ranked first.

DateSiteWhat changed
No changes recorded yet. The first daily run is the baseline; changes appear from the second day on.

Recent unblockers

DateSiteWhat changed
No changes recorded yet. The first daily run is the baseline; changes appear from the second day on.

Sites blocking Claude-User now

facebook.com (*) · fbcdn.net (*) · instagram.com (*) · twitter.com (*) · googlevideo.com (*) · amazon.com · x.com (*) · pinterest.com (*) · tiktok.com · baidu.com (*) · amazonvideo.com · msn.com · reddit.com (*) · skybridge.click (*) · registrar-servers.com (*) · nytimes.com · theguardian.com · cnn.com · meraki.com (*) · t.co (*) · imdb.com (*) · launchpad.net · reuters.com (*) · demdex.net (*) · weibo.com (*) · amazon.co.uk · naver.com (*) · bloomberg.com · wsj.com (*) · amazon.de · cookiedatabase.org (*) · gcdn.co (*) · kwai.net (*) · quora.com · amazon.co.jp · edgecdn.ru (*) · uol.com.br · wired.com · threads.com (*) · netcraze.io (*) · usatoday.com · dailymail.com · telegraph.co.uk · amazon.fr · amazon.ca · sharethrough.com · elpais.com · primevideo.com · amazon.in · hstgr.net (*) · lemonde.fr · imgsmail.ru (*) · fb.com (*) · hihonorcloud.com (*) · dailymail.co.uk · amazon.es · pinimg.com (*) · amazon.it · cnet.com · quantserve.com (*)

(*) blocked through the * group, not by name. Full list in current.csv.

Cite this

InfraRabbit AI Crawl Ledger, "Share of top websites blocking Claude-User", https://infrarabbit.com/crawlers/bot/Claude-User, retrieved 2026-10-26. CC BY 4.0.