K
KrOWLer
KrOWLer semantic web crawler
About this crawler
KrOWLer is a web crawler identified by the regular-expression pattern KrOWLer\/ in the User-Agent request header. It is categorised as academic. Use the regex above to detect, log, allow, or block KrOWLer traffic in your web server, CDN edge rules, or robots.txt.
Block-rate · top 25k sites
1.3%
Technical details
- Name
- KrOWLer
- Pattern
KrOWLer\/- Tags
- academic
- Added
- 2026/05/09
- Instances
- 2 known sample(s)
Sample User-Agent strings
KrOWLer/0.0.1, matentzn at cs dot man dot ac dot uk
KrOWLer/0.1.0, matentzn at cs dot man dot ac dot uk
Block this crawler
robots.txt — disallow KrOWLer:
User-agent: KrOWLer
Disallow: /
Apache .htaccess — return 403:
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} KrOWLer\/ [NC]
RewriteRule .* - [F,L]
Nginx — return 403 inside a server block:
if ($http_user_agent ~* "KrOWLer\\/") {
return 403;
}
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