CitedBy / Data / AI access / Drupal
AI-Access reference · read 26 Oct 2026 · first reading 23 Oct 2026
Drupal sites in the EU: which AI crawlers they block
On 26 Oct 2026, 9.3% of 528 popular EU websites built on Drupal asked at least one of GPTBot, ClaudeBot, Google-Extended and CCBot to stay out in robots.txt (7.1 to 12.1), rank 5 of the 6 CMSs with at least 100 sites read counting from the most blocking; 8.1% blocked GPTBot, 4.5% blocked at least one answer-engine search crawler, and across all 25 countries together 18.5% did.
What this measures
- 9.3% (49 of 528) block at least one of GPTBot, ClaudeBot, Google-Extended and CCBot on 26 Oct 2026; 9.4% did on 23 Oct 2026. All four: 5.1% (27).
- 8.1% block GPTBot (43); 6.8% block ClaudeBot; 6.4% block Google-Extended; 7.4% block CCBot.
- 4.5% (24) block at least one answer-engine search crawler (OAI-SearchBot, Claude-SearchBot, PerplexityBot). Googlebot, the control: 0.8%.
- llms.txt: 7.7% (40 of 518 that answered, 95% interval 5.7 to 10.3) publish a valid llms.txt, against 11.7% of all 10,223 sites that answered (read 25 Oct 2026).
Between 23 Oct 2026 and 26 Oct 2026, 1 of the 528 sites read in both runs changed what they ask at least one of the 14 AI crawlers to do (1 started blocking, 0 stopped). Next to it in the ranking: WordPress (10.4%), TYPO3 (7.6%). See all countries and CMSs.
By crawler
| Crawler | Block it, 23 Oct 2026 (n 533) | Block it, 26 Oct 2026 (n 528) | 95% interval | All 25 countries, 26 Oct 2026 |
|---|---|---|---|---|
| GPTBot | 8.3% (44) | 8.1% (43) | 6.1 to 10.8 | 15.5% |
| OAI-SearchBot | 3.8% (20) | 3.6% (19) | 2.3 to 5.6 | 5.4% |
| ChatGPT-User | 4.9% (26) | 4.9% (26) | 3.4 to 7.1 | 7.3% |
| ClaudeBot | 6.9% (37) | 6.8% (36) | 5.0 to 9.3 | 13.4% |
| Claude-SearchBot | 2.6% (14) | 2.5% (13) | 1.4 to 4.2 | 4.0% |
| Claude-User | 2.6% (14) | 2.5% (13) | 1.4 to 4.2 | 3.9% |
| PerplexityBot | 4.7% (25) | 4.5% (24) | 3.1 to 6.7 | 7.1% |
| Perplexity-User | 2.6% (14) | 2.5% (13) | 1.4 to 4.2 | 4.2% |
| Google-Extended | 6.6% (35) | 6.4% (34) | 4.6 to 8.9 | 11.4% |
| Applebot-Extended | 4.9% (26) | 4.7% (25) | 3.2 to 6.9 | 10.8% |
| CCBot | 7.5% (40) | 7.4% (39) | 5.5 to 9.9 | 15.3% |
| Bytespider | 8.3% (44) | 8.1% (43) | 6.1 to 10.8 | 14.4% |
| Amazonbot | 5.3% (28) | 5.1% (27) | 3.5 to 7.3 | 13.6% |
| meta-externalagent | 4.9% (26) | 4.7% (25) | 3.2 to 6.9 | 12.1% |
| Googlebot (control) | 0.6% (3) | 0.8% (4) | 0.3 to 1.9 | 0.8% |
| Bingbot (control) | 0.6% (3) | 0.8% (4) | 0.3 to 1.9 | 1.5% |
"Blocks" means the crawler may not fetch / under the site's robots.txt. Googlebot and Bingbot are controls: sites that shut out AI crawlers almost never shut out ordinary search.
Method and limits
- Sample: the top 600 domains by Tranco rank under each of 25 EU country-code domains (Luxembourg 250), Tranco list 56Z8N. The same sites are read again each week, so the dates on this page are repeat readings of one list, not new samples.
- What is read:
/robots.txtof each site, per RFC 9309; "blocks" means the crawler may not fetch/. Shares use the sites whose robots.txt was read as base; the others are coverage, not "allows". llms.txt: the file at/llms.txtis valid if it passes the llmstxt.org shape check (method). - Limits: robots.txt states a request, not what a firewall enforces, and this index does not measure what any assistant cites. A country-code domain is not the operator's country, and a CMS is a signature in the home page, not a verified platform. Popular sites only: a random sample of 24,550 .de, .at and .ch hosts reads lower, 2.27% for GPTBot (Ahrefs, Aug 2026).
- Data: One row per domain, 23 Oct 2026 · One row per domain, 26 Oct 2026 · llms.txt per domain, 25 Oct 2026. Licence CC BY 4.0; cite as "CitedBy EU AI-Access Index, 26 Oct 2026".
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