CapsuleChecker

monitoring CapsuleChecker

Capsule web crawler for link checking

About this crawler

CapsuleChecker is a web crawler identified by the regular-expression pattern CapsuleChecker in the User-Agent request header. It is categorised as monitoring. Use the regex above to detect, log, allow, or block CapsuleChecker traffic in your web server, CDN edge rules, or robots.txt.

Block-rate · top 25k sites

0.065%
latest snapshot
2026-06-04
matched key: CapsuleChecker
2026-05-012026-06-040.11%

Technical details

Name
CapsuleChecker
Pattern
CapsuleChecker
Tags
monitoring
Reference
https://www.capsulink.com/features
Added
2016/01/02
Instances
1 known sample(s)

Sample User-Agent strings

CapsuleChecker (http://www.capsulink.com/)

Block this crawler

robots.txt — disallow CapsuleChecker:

User-agent: CapsuleChecker Disallow: /

Apache .htaccess — return 403:

RewriteEngine On RewriteCond %{HTTP_USER_AGENT} CapsuleChecker [NC] RewriteRule .* - [F,L]

Nginx — return 403 inside a server block:

if ($http_user_agent ~* "CapsuleChecker") { return 403; }
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