Safe Official docs Search Engines

Bing Ads Crawler

Operated by Microsoft

Quick Facts

User-Agent:
AdIdxBot
Category:
Search Engines
Operator:
Microsoft
Safety:
Safe
Blocking Impact:
Low - No SEO ranking impact
SEO Impact Score:
2/10
Official docs:
www.bing.com

Confirmed by the operator

Microsoft names AdIdxBot on its own documentation page, linked above. The token, purpose and robots.txt behaviour on this profile come from that page, re-checked on September 22, 2026.

What is Bing Ads Crawler?

Bing Ads Crawler is a monitoring and validation agent operated by Microsoft. It checks pages, ad destinations, or policy compliance rather than collecting training data. It has no effect on search rankings.

Bing Ads Crawler is a monitoring and validation agent operated by Microsoft. It checks pages, ad destinations, or policy compliance rather than collecting training data. It has no effect on search rankings.
Bing Ads Crawler uses the user-agent token AdIdxBot. You can control it via robots.txt, meta tags (noai), or the emerging llms.txt standard. Robots.txt is voluntary; for hard enforcement, combine it with server-level IP blocking.

What happens if you block Bing Ads Crawler?

🔶 AI Visibility Trade-off - Blocking Bing Ads Crawler will not hurt Google or Bing rankings, but it can remove your content from AI search answers and assistant citations powered by this crawler. Block only if you have a deliberate reason.
Generally safe to allow; provides legitimate crawling value.

How to block Bing Ads Crawler with robots.txt

<code>User-agent: AdIdxBot</code> - Matching is case-insensitive. Robots.txt is fetched from the root of each subdomain separately.

Block completely (robots.txt)
User-agent: AdIdxBot Disallow: /
Allow all (robots.txt)
User-agent: AdIdxBot Allow: /
Block private only (robots.txt)
User-agent: AdIdxBot Disallow: /private/ Disallow: /api/ Disallow: /admin/ Allow: /
Nginx server block
# Nginx: Hard-block Bing Ads Crawler if ($http_user_agent ~* "AdIdxBot") { return 403 "Bot blocked"; }
Apache .htaccess
# Apache: Hard-block Bing Ads Crawler SetEnvIfNoCase User-Agent "AdIdxBot" bad_bot Order Allow,Deny Allow from all Deny from env=bad_bot
Meta robots tag
<meta name="robots" content="noindex, nofollow">
X-Robots-Tag header
X-Robots-Tag: noindex, nofollow

Is Bing Ads Crawler safe to allow?

Yes, Bing Ads Crawler is a safe and legitimate crawler operated by Microsoft. It follows the Robots Exclusion Protocol (RFC 9309) and can be controlled with standard robots.txt rules.
Verify by reverse-DNS lookup: legitimate Bing Ads Crawler requests resolve to Microsoft's domain.

What does Bing Ads Crawler do?

Understanding Bing Ads Crawler's purpose helps you decide whether to allow or block it.

  • Validates pages, ads, or policy compliance
  • Performs automated quality and safety checks
  • Does not collect training data
  • No impact on search rankings
  • Generally safe to allow

Frequently Asked Questions

What is the official user-agent string for Bing Ads Crawler?
The official user-agent string for Bing Ads Crawler is: AdIdxBot. Use this exact string in robots.txt, Nginx, Apache, or Cloudflare firewall rules to target this bot. Matching in robots.txt is case-insensitive. Verify a request genuinely comes from Bing Ads Crawler by performing a reverse-DNS lookup on the source IP.
Is Bing Ads Crawler safe?
Yes, Bing Ads Crawler is a safe and legitimate crawler operated by Microsoft. It follows the Robots Exclusion Protocol (RFC 9309) and can be controlled with standard robots.txt rules.
Will blocking Bing Ads Crawler hurt my SEO?
🔶 AI Visibility Trade-off - Blocking Bing Ads Crawler will not hurt Google or Bing rankings, but it can remove your content from AI search answers and assistant citations powered by this crawler. Block only if you have a deliberate reason.
How do I block Bing Ads Crawler in robots.txt?
Add the following lines to your /robots.txt file:
User-agent: AdIdxBot
Disallow: /

This instructs Bing Ads Crawler not to crawl any path on your site. To block only specific sections, replace / with the path (e.g., Disallow: /blog/).
Does Bing Ads Crawler respect robots.txt?
Bing Ads Crawler is operated by Microsoft and is expected to fetch and parse /robots.txt before crawling, following RFC 9309. For hard enforcement, combine robots.txt with server-level IP or user-agent blocking.
How do I verify if Bing Ads Crawler is crawling my site?
Search your web server access logs for the string AdIdxBot (case-insensitive: grep -i "AdIdxBot" /var/log/nginx/access.log). Filter by user-agent in your log analytics tool (GoAccess, AWStats, etc.).

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