hstspreload-bot
HSTS preload list checker verifying HTTPS enforcement across websites
About this crawler
hstspreload-bot is a web crawler identified by the regular-expression pattern hstspreload-bot in the User-Agent request header. It is categorised as scanner. Use the regex above to detect, log, allow, or block hstspreload-bot 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
- hstspreload-bot
- Pattern
hstspreload-bot- Tags
- scanner
- Reference
- https://hstspreload.org/
- Added
- 2026/04/17
- Instances
- 1 known sample(s)
Sample User-Agent strings
hstspreload-bot
Block this crawler
robots.txt — disallow hstspreload-bot:
User-agent: hstspreload-bot
Disallow: /
Apache .htaccess — return 403:
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} hstspreload-bot [NC]
RewriteRule .* - [F,L]
Nginx — return 403 inside a server block:
if ($http_user_agent ~* "hstspreload-bot") {
return 403;
}
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