SSL-Crawler
SSL security research crawler from Leibniz University Hannover
About this crawler
SSL-Crawler is a web crawler identified by the regular-expression pattern SSL-Crawler in the User-Agent request header. It is categorised as academic, scanner. Use the regex above to detect, log, allow, or block SSL-Crawler 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
- SSL-Crawler
- Pattern
SSL-Crawler- Tags
- academic, scanner
- Reference
- http://crawler.dcsec.uni-hannover.de
- Added
- 2026/05/09
- Instances
- 1 known sample(s)
Sample User-Agent strings
Mozilla/5.0 (X11; Linux i686) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/30.0.1599.101 Safari/537.36; SSL-Crawler: http://crawler.dcsec.uni-hannover.de
Block this crawler
robots.txt — disallow SSL-Crawler:
User-agent: SSL-Crawler
Disallow: /
Apache .htaccess — return 403:
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} SSL-Crawler [NC]
RewriteRule .* - [F,L]
Nginx — return 403 inside a server block:
if ($http_user_agent ~* "SSL-Crawler") {
return 403;
}
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