ClaudeBot
Anthropic · Model training · robots.txt token claudebot
6% of 30,177 measured domains disallow claudebot in robots.txt at the site root. Separately, and independently of robots.txt, 17.6% of 30,183 reachable domains refuse a request carrying this exact user agent at the network edge - a refusal the site's robots.txt does not declare and its owner often has not chosen.
Measured 2026-10-06 by direct request to every domain in the corpus. Method: how this is measured. Reuse under CC BY 4.0 with attribution.
Cite as: Crawl Census, "ClaudeBot blocking rate", measured 2026-10-06. https://crawlcensus.com/bot/claudebot
What it is definition
Collects web content that may contribute to training Anthropic's models; honors Crawl-delay.
ClaudeBot is operated by Anthropic and classified here as model training. These agents collect text and images that may end up in a training corpus. Disallowing one withholds new content from the next model. It does not withdraw anything collected before the disallow, and it does not remove the site from any answer engine.
Disallowing claudebot withholds content crawled from that point on from Anthropic's training data. It does not withdraw pages collected in earlier crawls, it does not reach copies already sitting in third-party datasets, and it does not remove the site from any answer surface.
- robots.txt token
- claudebot
- Operator
- Anthropic
- Purpose
- Model training
- Honors robots.txt
- yes
- Documentation
- https://support.claude.com/en/articles/8896518-does-anthropic-crawl-data-from-the-web-and-how-can-site-owners-block-the-crawler
Identity on the wire exact string
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)curl -A 'Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)' https://example.com/Replace the host with your own. A 403, a challenge page or an empty body means the edge is blocking the agent whatever robots.txt says.
How to allow it, how to block it robots.txt
User-agent: claudebot
Allow: /Absent any rule, the agent is already allowed, so this group only matters when your * group disallows something. Naming the agent replaces the * group for it entirely, so repeat here every disallow you still want to apply to it.
User-agent: claudebot
Disallow: /Disallowing claudebot withholds content crawled from that point on from Anthropic's training data. It does not withdraw pages collected in earlier crawls, it does not reach copies already sitting in third-party datasets, and it does not remove the site from any answer surface.
Sites that block it 60 shown
See every measured domain that blocks ClaudeBot
This list is served from a cache rebuilt just now. It is discarded the moment a rescan records a policy change for this agent, so a site that has just changed its robots.txt will drop off it within one scan rather than waiting for the cache to expire.
Compare Anthropic
Anthropic runs 4 agents in this registry, and they do different jobs. Blocking one says nothing about the others.
Common questions answered
Does blocking ClaudeBot remove me from Claude?
No, not by itself. ClaudeBot collects content for training, not for the index that answers questions. Anthropic's answer surfaces are governed separately by claude-user and claude-searchbot, which stay allowed unless you disallow them too. Content collected before the disallow is not withdrawn.
How do I verify ClaudeBot requests are genuine?
Anthropic publishes the address ranges its crawlers fetch from, linked from its crawler support article. Compare the source address of the request against that list. There is no reverse DNS name to check.
Check your own site free
See whether your robots.txt admits ClaudeBot today, and whether your edge agrees with it.