Cloudflare-Validator
Cloudflare security and performance validation
About this crawler
Cloudflare-Validator is a web crawler identified by the regular-expression pattern Cloudflare-Validator in the User-Agent request header. It is categorised as monitoring. Use the regex above to detect, log, allow, or block Cloudflare-Validator traffic in your web server, CDN edge rules, or robots.txt.
Block-rate · top 25k sites
No block-rate data for this crawler.
Technical details
- Name
- Cloudflare-Validator
- Pattern
Cloudflare-Validator- Tags
- monitoring
- Reference
- https://datadome.co/bots/cloudflare-crawler/
- Added
- 2026/04/17
- rDNS suffixes
.cloudflare.com- Instances
- 1 known sample(s)
rDNS verification (FCrDNS)
Verify a request is genuinely Cloudflare-Validator 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.
.cloudflare.com
Sample User-Agent strings
Cloudflare-Validator/1.0
Block this crawler
robots.txt — disallow Cloudflare-Validator:
User-agent: Cloudflare-Validator
Disallow: /
Apache .htaccess — return 403:
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} Cloudflare-Validator [NC]
RewriteRule .* - [F,L]
Nginx — return 403 inside a server block:
if ($http_user_agent ~* "Cloudflare-Validator") {
return 403;
}
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