Validator.nu
Validator.nu HTML validator web crawler
About this crawler
Validator.nu is a web crawler identified by the regular-expression pattern Validator\.nu in the User-Agent request header. It is categorised as monitoring. Use the regex above to detect, log, allow, or block Validator.nu traffic in your web server, CDN edge rules, or robots.txt.
Block-rate · top 25k sites
0.065%
Technical details
- Name
- Validator.nu
- Pattern
Validator\.nu- Tags
- monitoring
- Reference
- https://validator.w3.org/services
- Added
- 2018/10/14
- rDNS suffixes
.validator.nu- Instances
- 1 known sample(s)
rDNS verification (FCrDNS)
Verify a request is genuinely Validator.nu with forward-confirmed reverse DNS: the client IP's PTR record must end in one of the suffixes below and a forward A/AAAA lookup of that hostname must return the same IP. UA strings alone are spoofable; FCrDNS is not.
.validator.nu
Sample User-Agent strings
Validator.nu/LV
Block this crawler
robots.txt — disallow Validator.nu:
User-agent: Validator.nu
Disallow: /
Apache .htaccess — return 403:
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} Validator\.nu [NC]
RewriteRule .* - [F,L]
Nginx — return 403 inside a server block:
if ($http_user_agent ~* "Validator\\.nu") {
return 403;
}
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