Claude-SearchBot
Anthropic · Answer index · robots.txt token claude-searchbot
2% of 30,177 measured domains disallow claude-searchbot in robots.txt at the site root. Separately, and independently of robots.txt, 17.4% of 30,187 reachable domains refuse an AI crawler user agent at the network edge on two consecutive probes from different locations - a refusal the site's own 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, "Claude-SearchBot blocking rate", measured 2026-10-06. https://crawlcensus.com/bot/claude-searchbot
What it is definition
Indexes content to improve the relevance and accuracy of Claude's search results.
Claude-SearchBot is operated by Anthropic and classified here as answer index. These agents build the index an answer engine queries at question time. Disallowing one removes the site from those answers and from the citations that link back to it. Training is governed by separate tokens, so this is the expensive block, not the protective one.
Disallowing claude-searchbot removes the site from the index Claude search queries when it answers a question. The engine can then neither quote nor link the page, which is a traffic decision rather than a licensing one. Model training is governed by separate tokens.
- robots.txt token
- claude-searchbot
- Operator
- Anthropic
- Purpose
- Answer index
- 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 (compatible; Claude-SearchBot/1.0; +Claude-SearchBot@anthropic.com)curl -A 'Mozilla/5.0 (compatible; Claude-SearchBot/1.0; +Claude-SearchBot@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: claude-searchbot
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: claude-searchbot
Disallow: /Disallowing claude-searchbot removes the site from the index Claude search queries when it answers a question. The engine can then neither quote nor link the page, which is a traffic decision rather than a licensing one. Model training is governed by separate tokens.
Sites that block it 60 shown
See every measured domain that blocks Claude-SearchBot
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 Claude-SearchBot remove me from Claude search?
Yes, in effect. Claude-SearchBot builds the index Claude search reads at question time, so disallowing it takes the site out of those answers and out of the citations that link back to it. This is the block that costs traffic.
How do I verify Claude-SearchBot 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 Claude-SearchBot today, and whether your edge agrees with it.