anthropic-ai
Anthropic AI web crawler bot
About this crawler
anthropic-ai is a web crawler identified by the regular-expression pattern anthropic-ai in the User-Agent request header. It is categorised as ai-crawler. Use the regex above to detect, log, allow, or block anthropic-ai traffic in your web server, CDN edge rules, or robots.txt.
Block-rate · top 25k sites
4.4%
Technical details
- Name
- anthropic-ai
- Pattern
anthropic-ai- Tags
- ai-crawler
- Reference
- https://www.anthropic.com/
- Added
- 2026/04/07
- rDNS suffixes
.anthropic.com- Instances
- 1 known sample(s)
rDNS verification (FCrDNS)
Verify a request is genuinely anthropic-ai 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
anthropic-ai
Block this crawler
robots.txt — disallow anthropic-ai:
User-agent: anthropic-ai
Disallow: /
Apache .htaccess — return 403:
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} anthropic-ai [NC]
RewriteRule .* - [F,L]
Nginx — return 403 inside a server block:
if ($http_user_agent ~* "anthropic-ai") {
return 403;
}
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