Riddler http://riddler.io
Internet scanning crawler gathering domain and IP metadata
About this crawler
Riddler http://riddler.io is a web crawler identified by the regular-expression pattern Riddler \(http:\/\/riddler\.io in the User-Agent request header. It is categorised as scanner. Use the regex above to detect, log, allow, or block Riddler http://riddler.io traffic in your web server, CDN edge rules, or robots.txt.
Block-rate · top 25k sites
0.064%
Technical details
- Name
- Riddler http://riddler.io
- Pattern
Riddler \(http:\/\/riddler\.io- Tags
- scanner
- Reference
- http://riddler.io/about
- Added
- 2026/04/17
- Instances
- 1 known sample(s)
Sample User-Agent strings
Riddler (http://riddler.io/about)
Block this crawler
robots.txt — disallow Riddler http://riddler.io:
User-agent: Riddler http://riddler.io
Disallow: /
Apache .htaccess — return 403:
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} Riddler \(http:\/\/riddler\.io [NC]
RewriteRule .* - [F,L]
Nginx — return 403 inside a server block:
if ($http_user_agent ~* "Riddler \\(http:\\/\\/riddler\\.io") {
return 403;
}
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