CSS Certificate Spider
CSS Security certificate validation spider
About this crawler
CSS Certificate Spider is a web crawler identified by the regular-expression pattern CSS Certificate Spider in the User-Agent request header. It is categorised as scanner. Use the regex above to detect, log, allow, or block CSS Certificate Spider traffic in your web server, CDN edge rules, or robots.txt.
Block-rate · top 25k sites
0.065%
Technical details
- Name
- CSS Certificate Spider
- Pattern
CSS Certificate Spider- Tags
- scanner
- Reference
- http://www.css-security.com/certificatespider/
- Added
- 2026/05/09
- Instances
- 1 known sample(s)
Sample User-Agent strings
CSS Certificate Spider (http://www.css-security.com/certificatespider/)
Block this crawler
robots.txt — disallow CSS Certificate Spider:
User-agent: CSS Certificate Spider
Disallow: /
Apache .htaccess — return 403:
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} CSS Certificate Spider [NC]
RewriteRule .* - [F,L]
Nginx — return 403 inside a server block:
if ($http_user_agent ~* "CSS Certificate Spider") {
return 403;
}
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