--- title: "Which AI crawlers do news sites block most? CCBot tops 75%" url: https://seomadman.com/reports/news-site-ai-crawler-blocking-by-bot-2026 section: reports published: 2026-09-20T00:00:00.000Z modified: 2026-09-20T00:00:00.000Z author: Adam Hafez topics: ["AI search"] --- # Which AI crawlers do news sites block most? CCBot tops 75% ## The short answer A robots.txt scan of the top 50 UK and top 50 US news sites finds CCBot blocked by 75%, the highest of any crawler checked, ahead of Anthropic-ai at 72%, ClaudeBot at 69% and GPTBot at 62%. Google-Extended is blocked least among training bots, at 46%. Overall, 79% of sites block at least one AI training bot. ## Key takeaways - CCBot, Common Crawl's bot, is the single most-blocked AI crawler among the 100 news sites checked, disallowed by 75% of them. - GPTBot is blocked by 62% of the sites studied, well behind CCBot, Anthropic-ai and ClaudeBot but still ahead of Google-Extended. - Google-Extended is the least-blocked training bot at 46%, and US publishers block it far more often than UK publishers, 58% versus 29%. - Live retrieval bots are blocked less than training bots overall, with Perplexity-User disallowed by only 17% of sites versus 67% for PerplexityBot. - Just 14% of the news sites studied block every AI bot the researchers checked, while 18% block none of them. Our own [report on live 403 rates](/reports/ai-crawler-blocking-rate-trend-2026) tracks how often an AI crawler request is actually refused at the edge, and cites a robots.txt scan that ranks crawlers by how often they are named in a disallow rule. BuzzStream ran a separate scan in the same spirit but narrowed to one publisher category: the top 100 UK and US news sites, individually checked against 11 named AI bots rather than a broad web-wide sample. That narrower lens surfaces a per-crawler ranking and a UK-versus-US split that a general sample would average away. ## Which crawlers do news sites block most? Across the 100 sites, CCBot is blocked by 75%, the highest rate BuzzStream recorded. Anthropic-ai follows at 72%, then ClaudeBot at 69%, PerplexityBot at 67%, Claude-Web at 66%, GPTBot at 62% and Applebot-Extended at 61%. Live-retrieval bots trail behind: OAI-SearchBot is blocked by 49% of sites, Google-Extended by 46%, ChatGPT-User by 40%, and Perplexity-User by just 17%, the lowest figure in the study. ## Why is Google-Extended blocked less than GPTBot? Google-Extended's 46% overall rate splits sharply by country: US publishers block it at 58% against 29% for UK publishers, a wider regional gap than BuzzStream found for any other crawler in the study. The publication does not explain the split, but Google-Extended controls only whether a site's content feeds Gemini and AI Overviews training, not whether Google can still crawl and rank the page through Googlebot, which may make UK publishers more willing to leave it open. ## How much do training bots and search bots differ? BuzzStream groups the 11 crawlers into training bots and live-retrieval or user-triggered bots, and the gap between the two groups is consistent: 79% of the 100 sites block at least one training bot, against 71% for live-retrieval bots. Within retrieval bots, the split is starker still, PerplexityBot at 67% against Perplexity-User at 17%, meaning many sites disallow Perplexity's background crawl while still letting a live, user-initiated Perplexity fetch through. ## Why we care **A crawler-by-crawler ranking, not just an aggregate block rate, tells a publisher which specific bot to check first.** If CCBot is blocked by three in four of the largest news sites, a smaller publisher weighing the same decision is looking at what has become close to a category norm rather than a fringe move, while Google-Extended's 46% overall rate shows the opposite is true for it. **The UK-US gap on Google-Extended is the most actionable single number in the study.** A US publisher blocking that crawler is following the regional majority at 58%; a UK publisher doing the same is in the 29% minority, and either one should know which group they are joining before setting the rule, since [our earlier robots.txt research](/research/ai-crawler-policies-news-sites) found that publishers frequently copy a competitor's policy without checking what it actually blocks. ## Frequently asked questions ### Which AI crawler do the most news sites block? CCBot, the crawler behind the Common Crawl dataset that many AI labs train on, is blocked by 75% of the 100 top UK and US news sites BuzzStream checked in April 2026, the highest rate of any crawler in the study. ### Do news sites block GPTBot more than Google-Extended? Yes. GPTBot is disallowed by 62% of the sites studied, compared with 46% for Google-Extended, which was the least-blocked training bot in BuzzStream's sample. US publishers drove most of that gap, blocking Google-Extended at 58% against 29% for UK publishers. ## Sources 1. [Which News Sites Block AI Crawlers in 2026? [New Data]](https://www.buzzstream.com/blog/publishers-block-ai-study/) - BuzzStream (primary)