csirt.cz
Czech cybersecurity team vulnerability scanning bot
About this crawler
csirt.cz is a web crawler identified by the regular-expression pattern csirt\.cz in the User-Agent request header. It is categorised as scanner. Use the regex above to detect, log, allow, or block csirt.cz 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
- csirt.cz
- Pattern
csirt\.cz- Tags
- scanner
- Reference
- https://csirt.cz/cs/dns-crawler/
- Added
- 2026/04/17
- Instances
- 1 known sample(s)
Sample User-Agent strings
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.131 Safari/537.36 1.6.4 (+https://csirt.cz/cs/dns-crawler)
Block this crawler
robots.txt — disallow csirt.cz:
User-agent: csirt.cz
Disallow: /
Apache .htaccess — return 403:
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} csirt\.cz [NC]
RewriteRule .* - [F,L]
Nginx — return 403 inside a server block:
if ($http_user_agent ~* "csirt\\.cz") {
return 403;
}
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