CertChief
SSL/TLS certificate monitoring and auditing
About this crawler
CertChief is a web crawler identified by the regular-expression pattern CertChief in the User-Agent request header. It is categorised as scanner. Use the regex above to detect, log, allow, or block CertChief 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
- CertChief
- Pattern
CertChief- Tags
- scanner
- Reference
- https://datadome.co/bots/cert-chief-bot/
- Added
- 2026/04/17
- Instances
- 2 known sample(s)
Sample User-Agent strings
CertChiefBot
Mozilla/5.0 (compatible; CertChief; +https://www.certchief.com/)
Block this crawler
robots.txt — disallow CertChief:
User-agent: CertChief
Disallow: /
Apache .htaccess — return 403:
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} CertChief [NC]
RewriteRule .* - [F,L]
Nginx — return 403 inside a server block:
if ($http_user_agent ~* "CertChief") {
return 403;
}
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