JUST-CRAWLER
JustSystems web crawler
About this crawler
JUST-CRAWLER is a web crawler identified by the regular-expression pattern JUST-CRAWLER in the User-Agent request header. It is categorised as search-engine. Use the regex above to detect, log, allow, or block JUST-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
- JUST-CRAWLER
- Pattern
JUST-CRAWLER- Tags
- search-engine
- Reference
- http://www.justsystems.com/jp/tech/crawler/
- Added
- 2026/05/09
- Instances
- 1 known sample(s)
Sample User-Agent strings
JUST-CRAWLER(+http://www.justsystems.com/jp/tech/crawler/)
Block this crawler
robots.txt — disallow JUST-CRAWLER:
User-agent: JUST-CRAWLER
Disallow: /
Apache .htaccess — return 403:
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} JUST-CRAWLER [NC]
RewriteRule .* - [F,L]
Nginx — return 403 inside a server block:
if ($http_user_agent ~* "JUST-CRAWLER") {
return 403;
}
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