Meta-ExternalAds user agent
Operated by Meta
Meta-ExternalAds is Meta's crawler for improving advertising and other business products and services.
The Meta-ExternalAds bot at a glance
- Meta-ExternalAds is operated by Meta and checks landing pages for an advertising platform.
- The robots.txt token for Meta-ExternalAds is meta-externalads.
- Blocking a platform fetcher has no effect on organic search rankings.
- Meta-ExternalAds robots.txt support: Yes.
- Recommendation for Generative Engine Optimization (GEO): Allow.
What is Meta-ExternalAds?
Meta-ExternalAds crawls pages for Meta’s advertising systems, such as understanding landing pages.
Advertisers on Meta platforms should allow it.
Should you block Meta-ExternalAds?
Allow Meta-ExternalAds unless it causes a measurable load problem.
| Effect on search rankings | Blocking a platform fetcher has no effect on organic search rankings. |
|---|---|
| Effect on AI visibility | Blocking breaks the feature the fetcher serves, such as ad approval or feed updates. |
| Follows robots.txt | Yes |
| Recommendation | Allow |
How to block or allow Meta-ExternalAds
Put the robots.txt rule in the file at the root of every domain and subdomain, for example https://example.com/robots.txt. The token meta-externalads is matched case-insensitively.
robots.txt: block
# Block Meta-ExternalAds
User-agent: meta-externalads
Disallow: /robots.txt: allow
# Allow Meta-ExternalAds
User-agent: meta-externalads
Allow: /robots.txt: partial
# Keep Meta-ExternalAds out of private areas only
User-agent: meta-externalads
Disallow: /wp-admin/
Disallow: /cart/
Disallow: /checkout/
Disallow: /my-account/
Allow: /Nginx
# Nginx: return 403 to Meta-ExternalAds
if ($http_user_agent ~* "(meta\-externalads)") {
return 403;
}Apache
# Apache .htaccess: return 403 to Meta-ExternalAds
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} (meta\-externalads) [NC]
RewriteRule .* - [F,L]Cloudflare WAF
# Cloudflare > Security > WAF > Custom rule, action: Block
(http.user_agent contains "meta-externalads")How to verify real Meta-ExternalAds traffic
Meta publishes no IP list or reverse DNS pattern for Meta-ExternalAds, so the user agent cannot be verified. Anyone can send the same string. Rate-limit unusual volume instead of trusting the name.
How to find Meta-ExternalAds in your server logs
Search the web server access log for the token. The command below counts Meta-ExternalAds requests per URL on Nginx or Apache.
grep -i "meta-externalads" access.log | awk '{print $7}' | sort | uniq -c | sort -rn | head -20For a full report per AI bot, upload the log to the AI Log File Analyzer, a free tool by Justin Hà.
Meta-ExternalAds user agent string
The full user agent Meta publishes for Meta-ExternalAds. Version numbers such as Chrome/W.X.Y.Z change over time, so match the token, not the whole string.
meta-externalads/1.1Meta-ExternalAds FAQ
Meta-ExternalAds identifies itself with the robots.txt token "meta-externalads". A typical request header reads: meta-externalads/1.1
Yes. Meta states that Meta-ExternalAds follows robots.txt rules written for the "meta-externalads" token.
Blocking a platform fetcher has no effect on organic search rankings. Blocking breaks the feature the fetcher serves, such as ad approval or feed updates.
Add two lines to the robots.txt file at the root of each domain and subdomain: "User-agent: meta-externalads" followed by "Disallow: /". The token is case-insensitive. Changes can take up to 24 hours to be picked up.
Not reliably. Meta publishes no IP list or reverse DNS pattern for Meta-ExternalAds, so anyone can send the same user agent. Rate-limit unusual volume instead of trusting the name.
Search your server access log for "meta-externalads", for example with: grep -i "meta-externalads" access.log. The AI Log File Analyzer by Justin Hà counts visits per AI bot from an uploaded log file.
Sources: Meta crawler documentation. Last reviewed by Justin Hà.
See which of these bots actually reach your website
The AI Log File Analyzer by Justin Hà counts visits from GPTBot, ClaudeBot, PerplexityBot and other AI crawlers in your server log, for free. The GEO Technical Package sets up robots.txt, llms.txt and crawler access for AI search.
