WhatWeb
Web technology scanner identifying frameworks servers and CMS configurations
About this crawler
WhatWeb is a web crawler identified by the regular-expression pattern WhatWeb\/ in the User-Agent request header. It is categorised as scanner. Use the regex above to detect, log, allow, or block WhatWeb traffic in your web server, CDN edge rules, or robots.txt.
Block-rate · top 25k sites
0.26%
Technical details
- Name
- WhatWeb
- Pattern
WhatWeb\/- Tags
- scanner
- Reference
- https://www.whatweb.net/
- Added
- 2026/04/17
- Instances
- 1 known sample(s)
Sample User-Agent strings
WhatWeb/0.5.5
Block this crawler
robots.txt — disallow WhatWeb:
User-agent: WhatWeb
Disallow: /
Apache .htaccess — return 403:
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} WhatWeb\/ [NC]
RewriteRule .* - [F,L]
Nginx — return 403 inside a server block:
if ($http_user_agent ~* "WhatWeb\\/") {
return 403;
}
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