01 · Operator
Who operates TYPO3 LinkValidator
- Company
- TYPO3 CMS (self-hosted)
- Type
- Monitoring bot
- Official docs
- docs.typo3.org
02 · Behavior
What TYPO3 LinkValidator does
The linkvalidator extension checks links in a TYPO3 site and lists broken ones in the backend. External links are checked only when enabled. It sends a HEAD request and falls back to a ranged GET. Requests come from the server of the TYPO3 site that links to you.
03 · Impact
Why TYPO3 LinkValidator matters for your site
If you allow it
- It helps sites linking to you detect broken links
- Requests are light HEAD or partial GET calls
If you block it
- It brings no traffic
- No central operator or verification method exists
04 · Allow
How to allow TYPO3 LinkValidator
robots.txt
# TYPO3 LinkValidator has no documented robots.txt token and does not read robots.txt.
# Use a Cloudflare, nginx or Apache rule instead.Cloudflare
# Security › WAF › Custom rules › Create rule
Expression: (http.user_agent contains "TYPO3 LinkValidator")
Action: Skip › All Super Bot Fight Mode rules
# Also check Security › Bots: "Block AI bots" can block it regardless of robots.txt.WordPress
# TYPO3 LinkValidator has no documented robots.txt token and does not read robots.txt.
# Use a Cloudflare, nginx or Apache rule instead.nginx
# nginx serves every user agent by default.
# Make sure no rule like this blocks it:
# if ($http_user_agent ~* "TYPO3 LinkValidator") { return 403; }Apache
# Apache serves every user agent by default.
# Make sure .htaccess has no rule like this:
# RewriteCond %{HTTP_USER_AGENT} TYPO3 LinkValidator [NC]
# RewriteRule .* - [F,L]05 · Block
How to block TYPO3 LinkValidator
Start with robots.txt. If TYPO3 LinkValidator keeps showing up in your logs, block it at your CDN or web server.
robots.txt
# TYPO3 LinkValidator has no documented robots.txt token and does not read robots.txt.
# Use a Cloudflare, nginx or Apache rule instead.Cloudflare
# Security › WAF › Custom rules › Create rule
Expression: (http.user_agent contains "TYPO3 LinkValidator")
Action: BlockWordPress
# TYPO3 LinkValidator has no documented robots.txt token and does not read robots.txt.
# Use a Cloudflare, nginx or Apache rule instead.nginx
# In your server { } block:
if ($http_user_agent ~* "TYPO3 LinkValidator") {
return 403;
}Apache
# .htaccess
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} TYPO3 LinkValidator [NC]
RewriteRule .* - [F,L]
</IfModule>06 · User agents
User agents we see for TYPO3 LinkValidator
The user agent published by the operator:
TYPO3 LinkValidator07 · Verification
Is it really TYPO3 LinkValidator?
TYPO3 LinkValidator’s operator publishes no IP ranges or hostnames, so requests cannot be verified. Treat the user agent as a claim, and watch your logs for unusual request rates.
FAQ
Questions about TYPO3 LinkValidator
What is TYPO3 LinkValidator?
It is the link checking extension in the TYPO3 CMS core. It tests links on a TYPO3 site and reports broken ones.
Who sends TYPO3 LinkValidator requests?
Any TYPO3 site that links to you and has external link checking enabled. There is no central operator.
How heavy are its requests?
It uses HEAD by default and falls back to a GET for a byte range, by default bytes 0-4048.
Last updated Oct 19, 2026