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 October 19, 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

Bing Ads Crawler in context

Bing Ads Crawler is a utility crawler operated by Microsoft. In plain terms, it checks pages for an SEO, uptime or analytics service. Our database files it under search engines and ranks it Tier 3, mid-priority crawlers with a clear purpose but a smaller audience. 62 of the 63 search engines in our database share this tier.

Its safety rating is safe and its blocking impact is not documented. So the decision about Bing Ads Crawler rests on what you want from Microsoft, not on its behaviour. How we rate safety and impact.

How site owners treat Bing Ads Crawler

Our robots.txt study of the Tranco top 10,000 did not track AdIdxBot as a named token, so we do not publish an adoption figure for it. If you run a large site, your own logs are the best evidence of how often it visits.

Does it follow robots.txt?

Bing Ads Crawler's operator does not clearly document how it treats robots.txt. Write the Bing Ads Crawler rule anyway, then confirm in your logs that its requests stop.

Microsoft crawlers and close alternatives

Bing Ads Crawler is one of 6 Microsoft crawlers in our database. A User-agent: AdIdxBot group controls Bing Ads Crawler only; the other Microsoft tokens below need their own lines.

  • AdIdxBot: this crawler (Tier 3)
  • AzureAI-SearchBot: Azure AI Search, builds a search or answer index (Tier 2)
  • bingbot: Bing Search, builds a search or answer index (Tier 3)
  • BingPreview: Bing Page Snapshot, builds a search or answer index (Tier 3)
  • BingVideoPreview: Bing Video Preview, builds a search or answer index (Tier 3)
  • MicrosoftPreview: Microsoft Preview, fetches a page to build a link preview when someone shares it (Tier 3)

To give Bing Ads Crawler the same answer as its siblings, stack User-agent: AdIdxBot with their lines above one set of rules; to treat Bing Ads Crawler differently, give it its own group.

Related: how AI engines choose their sources

Other search engines that do the same job (checks pages for an SEO, uptime or analytics service) include Baiduspider-ads from Baidu, Baiduspider-cpro from Baidu, YaDirectFetcher from Yandex, YandexAdNet from Yandex, YandexCheckBot from Yandex, YandexDirect from Yandex. Deciding about Bing Ads Crawler is usually a decision about the whole group, so check how your file treats these too.

We first recorded AdIdxBot on September 22, 2026. Microsoft documents it on bing.com, and we recheck that page before each release.

Which rule Bing Ads Crawler actually follows

Bing Ads Crawler reads exactly one group in robots.txt, the most specific one that names AdIdxBot, and never combines rules across groups. This short file shows the trap:

User-agent: *
Disallow: /private/

User-agent: AdIdxBot
Disallow: /drafts/
  1. Find the group. Bing Ads Crawler looks for a group naming AdIdxBot. One exists, so it ignores User-agent: * completely.
  2. Apply only that group. It is refused /drafts/ and nothing else.
  3. The surprise. /private/ is open to Bing Ads Crawler, because that rule lives in the * group it no longer reads. To keep it out of both, repeat Disallow: /private/ inside its own group.
Test yourself: does a rule under User-agent: * apply to Bing Ads Crawler if the file also has a User-agent: AdIdxBot group?

No. Once a group names it, Bing Ads Crawler reads only that group. Put every rule you want it to follow inside its own group.

Test yourself: will blocking Bing Ads Crawler remove your pages from AI answers?

Often, yes. Bing Ads Crawler is a utility crawler, so pages it cannot fetch can drop out of the answers or results it supports.

Related: writing content AI engines can cite

Test yourself: is User-agent: adidxbot the same as User-agent: AdIdxBot?

Yes. RFC 9309 makes user-agent matching case-insensitive. Paths are a different story: Disallow: /Blog/ does not block /blog/.

Should you allow Bing Ads Crawler? Decide by situation

Recommended setting for Bing Ads Crawler by type of site
If you are...Recommended setting
You publish content and want AI answers to cite itLow stakes either way. It does not decide whether AI answers cite you.
You license content and want to stop AI trainingBlocking it does not stop training, because Bing Ads Crawler is a utility crawler. Block the operator's training crawler instead.
You run an online shopAllow it unless it is overloading your servers.
Your server is under load from botsRate-limit before blocking. It is rated safe in our database.

Check Bing Ads Crawler on your own site

  1. Open /robots.txt on your domain and search for AdIdxBot. If it is not named, it follows User-agent: *.
  2. List the Disallow lines in the group Bing Ads Crawler follows and test your key URLs against them; the longest match wins, and Allow wins a tie.
  3. Look beyond the file. A firewall or bot manager can refuse Bing Ads Crawler even when robots.txt allows it, and that never shows in the file.
  4. Run our blocked AI crawler check to see how Bing Ads Crawler and every other crawler we track are treated in one pass, including firewall refusals.

Common mistakes with Bing Ads Crawler

The errors we see most often with Bing Ads Crawler in the files and firewalls we test:

  1. Treating Bing Ads Crawler as an AI or search crawler. Blocking it has little effect on visibility; decide based on load and what it does with your data.
  2. Relying on robots.txt alone when Bing Ads Crawler is rated caution or aggressive. Back the rule with a server-side block.
  3. Blocking Bing Ads Crawler by IP alone. Ranges change; match the token and verify with logs.

All three hide inside a file that looks correct, so check Bing Ads Crawler from outside after every change.

Spotting Bing Ads Crawler in your logs

robots.txt says what Bing Ads Crawler may do; your access logs show what it actually did.

Count requests

On a server with standard Nginx or Apache logs, this counts matching requests per day (adjust the log path for your host):

grep -iE "AdIdxBot" /var/log/nginx/access.log \
  | awk '{print $4}' | cut -d: -f1 | sort | uniq -c

And this shows which paths it requested most, which is the quickest way to see whether your Disallow lines are being respected:

grep -iE "AdIdxBot" /var/log/nginx/access.log \
  | awk '{print $7}' | sort | uniq -c | sort -rn | head -20

Check the requests are genuine

Anyone can send the Bing Ads Crawler user-agent, so confirm the source before acting on a match:

  • AdIdxBot: we hold no published IP list, so use reverse DNS where the operator documents a hostname and treat an unverifiable Bing Ads Crawler request with caution.

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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