01 · Operator
Who operates Yahoo Ad Monitoring
- Company
- Yahoo
- Type
- Other bot
- Official docs
- help.yahoo.com
02 · Behavior
What Yahoo Ad Monitoring does
When an advertiser lists a URL with Yahoo advertising, this client fetches the landing page. Yahoo documents desktop and mobile user agents for it. It only visits URLs used in ads.
03 · Impact
Why Yahoo Ad Monitoring matters for your site
If you allow it
- Needed for ads that point to your site
- Only fetches ad landing pages
If you block it
- No benefit if you do not advertise with Yahoo
04 · Allow
How to allow Yahoo Ad Monitoring
robots.txt
# Yahoo Ad Monitoring 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 "Yahoo Ad Monitoring")
Action: Skip › All Super Bot Fight Mode rules
# Also check Security › Bots: "Block AI bots" can block it regardless of robots.txt.WordPress
# Yahoo Ad Monitoring 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 ($http_user_agent ~* "Yahoo Ad Monitoring") { return 403; }Apache
# Apache serves every user agent by default.
# Make sure .htaccess has no rule like this:
# RewriteCond %{HTTP_USER_AGENT} Yahoo Ad Monitoring [NC]
# RewriteRule .* - [F,L]05 · Block
How to block Yahoo Ad Monitoring
Start with robots.txt. If Yahoo Ad Monitoring keeps showing up in your logs, block it at your CDN or web server.
robots.txt
# Yahoo Ad Monitoring has no documented robots.txt token and does not read robots.txt.
# Use a Cloudflare, nginx or Apache rule instead.Cloudflare
# Security › WAF › Custom rules › Create rule
Expression: (http.user_agent contains "Yahoo Ad Monitoring")
Action: BlockWordPress
# Yahoo Ad Monitoring has no documented robots.txt token and does not read robots.txt.
# Use a Cloudflare, nginx or Apache rule instead.nginx
# In your server { } block:
if ($http_user_agent ~* "Yahoo Ad Monitoring") {
return 403;
}Apache
# .htaccess
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} Yahoo Ad Monitoring [NC]
RewriteRule .* - [F,L]
</IfModule>06 · User agents
User agents we see for Yahoo Ad Monitoring
The user agent published by the operator:
Mozilla/5.0 (compatible; Yahoo Ad monitoring; https://help.yahoo.com/kb/yahoo-ad-monitoring-SLN24857.html)07 · Verification
Is it really Yahoo Ad Monitoring?
Yahoo Ad Monitoring’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 Yahoo Ad Monitoring
What is Yahoo Ad Monitoring?
It is a Yahoo client that fetches landing pages of URLs listed with Yahoo advertising services.
Why does Yahoo Ad Monitoring visit my site?
Your site is likely the landing page of an ad running on Yahoo advertising services.
Last updated Oct 14, 2026