Riddler http://riddler.io

scanner 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%
latest snapshot
2026-05-31
matched key: Riddler (http://riddler.io/about)
2026-05-142026-05-310.11%

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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