Claude-SearchBot
Anthropic Claude search web crawler bot
About this crawler
Claude-SearchBot is a web crawler identified by the regular-expression pattern Claude-SearchBot in the User-Agent request header. It is categorised as ai-fetcher, search-engine. Use the regex above to detect, log, allow, or block Claude-SearchBot traffic in your web server, CDN edge rules, or robots.txt.
Block-rate · top 25k sites
1.8%
Technical details
- Name
- Claude-SearchBot
- Pattern
Claude-SearchBot- Tags
- ai-fetcher, search-engine
- Reference
- https://useragents.io/uas/mozilla-5-0-applewebkit-537-36-khtml-like-gecko-compatible-claudebot-1-0-supportanthropic-com_954fa13a8e1e46d8267fb56e2d48100e
- Added
- 2026/04/07
- rDNS suffixes
.anthropic.com- Instances
- 1 known sample(s)
rDNS verification (FCrDNS)
Verify a request is genuinely Claude-SearchBot with forward-confirmed reverse DNS: the client IP's PTR record must end in one of the suffixes below and a forward A/AAAA lookup of that hostname must return the same IP. UA strings alone are spoofable; FCrDNS is not.
.anthropic.com
Sample User-Agent strings
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Claude-SearchBot/1.0; +https://www.anthropic.com)
Block this crawler
robots.txt — disallow Claude-SearchBot:
User-agent: Claude-SearchBot
Disallow: /
Apache .htaccess — return 403:
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} Claude-SearchBot [NC]
RewriteRule .* - [F,L]
Nginx — return 403 inside a server block:
if ($http_user_agent ~* "Claude-SearchBot") {
return 403;
}
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