Xenu Link Sleuth

seo Xenu Link Sleuth

Xenu link checker web crawler tool

About this crawler

Xenu Link Sleuth is a web crawler identified by the regular-expression pattern Xenu Link Sleuth in the User-Agent request header. It is categorised as seo. Use the regex above to detect, log, allow, or block Xenu Link Sleuth 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: Xenu Link Sleuth
2026-05-012026-06-040.11%

Technical details

Name
Xenu Link Sleuth
Pattern
Xenu Link Sleuth
Tags
seo
Reference
http://home.snafu.de/tilman/xenulink.html
Added
2017/08/19
Instances
1 known sample(s)

Sample User-Agent strings

Xenu Link Sleuth/1.3.8

Block this crawler

robots.txt — disallow Xenu Link Sleuth:

User-agent: Xenu Link Sleuth Disallow: /

Apache .htaccess — return 403:

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

Nginx — return 403 inside a server block:

if ($http_user_agent ~* "Xenu Link Sleuth") { return 403; }
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