UASlinkChecker
Link checker validating URL availability and HTTP status
About this crawler
UASlinkChecker is a web crawler identified by the regular-expression pattern UASlinkChecker\/ in the User-Agent request header. It is categorised as seo. Use the regex above to detect, log, allow, or block UASlinkChecker 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
- UASlinkChecker
- Pattern
UASlinkChecker\/- Tags
- seo
- Reference
- https://udger.com/support/UASlinkChecker
- Added
- 2026/04/17
- Instances
- 1 known sample(s)
Sample User-Agent strings
Mozilla/5.0 (compatible; UASlinkChecker/2.1; +https://udger.com/support/UASlinkChecker)
Block this crawler
robots.txt — disallow UASlinkChecker:
User-agent: UASlinkChecker
Disallow: /
Apache .htaccess — return 403:
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} UASlinkChecker\/ [NC]
RewriteRule .* - [F,L]
Nginx — return 403 inside a server block:
if ($http_user_agent ~* "UASlinkChecker\\/") {
return 403;
}
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