To check whether AI crawlers can access your website, inspect the live /robots.txt for the specific bot and page path, test the page’s HTTP response, and look for real requests in your CDN, WAF, or server logs. An “allow” rule only states your site’s crawl policy; it does not prove a bot fetched or used the page.
First choose which kind of AI access you mean
“AI crawler” is not one universal bot. Services use different crawlers for search, model development, and user-requested page retrieval. Check the identifier associated with the outcome you care about, and consult the operator’s current documentation because bot names and IP ranges can change.
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| Operator and crawler | Published role | What to check |
|---|---|---|
| OpenAI OAI-SearchBot | Used to surface websites in ChatGPT search features. | Check its rules and requests when investigating ChatGPT search access. OpenAI crawler documentation. |
| OpenAI GPTBot | Crawls content that may be used to train OpenAI foundation models. | Its setting is independent of OAI-SearchBot’s; allowing one does not mean allowing the other. OpenAI crawler documentation. |
| OpenAI ChatGPT-User | Used for some user actions and page visits, rather than automatic web crawling. | A user-triggered fetch may behave differently from automatic crawling and may not be governed by robots.txt. OpenAI crawler documentation. |
| Anthropic ClaudeBot, Claude-SearchBot, and Claude-User | Anthropic documents separate roles for model development, search, and user-directed retrieval. | Check the bot relevant to the access outcome. Anthropic crawler information. |
| PerplexityBot and Perplexity-User | PerplexityBot supports search results; Perplexity-User supports user-directed fetches. | The search and user-directed settings work independently; Perplexity says its user-directed fetch generally ignores robots.txt for that requested fetch. Perplexity crawler documentation. |
| Google common crawlers | Google distinguishes common crawlers from special-case crawlers and user-triggered fetchers. | Do not assume every Google fetcher follows the same rules. Google crawler overview. |
Use each operator’s current official page for crawler details and, where needed, published IP data. Avoid relying on a bot name alone when verifying identity: user-agent strings can be imitated.
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Check the live robots.txt rules
- Open
https://your-domain.example/robots.txtin a browser or request it with an HTTP client. Confirm it returns successfully and inspect the response body that is publicly served. - Find the user-agent group for the specific crawler. Check its rules and any general rules that apply, then test the exact URL path you care about. Do not assume a rule for one bot also applies to another.
- Check that the file is served as expected. A failed response, unexpected redirect, or platform-managed rules can change what crawlers receive. If your public file differs from the version in your site repository, investigate hosting, CDN, or other platform settings.
Robots.txt expresses a crawl policy; it is not a security boundary. RFC 9309, the IETF’s September 2022 Robots Exclusion Protocol standard, states: “These rules are not a form of access authorization.” Read RFC 9309.
Test the page response, not just the policy
Request the target page and inspect what a client receives. A local request with a crawler’s user-agent string can be a useful preliminary diagnostic, but it does not prove that the operator’s real crawler network gets the same response.
- Check the HTTP status and follow the redirect chain. Look for access-denied responses, authentication requirements, rate limits, and unexpected redirects.
- Check for CAPTCHA, JavaScript, or other challenges that could prevent a crawler from receiving usable page content.
- Confirm the response contains the intended content rather than an error page, empty shell, or partial page.
A successful test from your own connection only establishes what that request received. Your CDN, WAF, or origin may treat a real crawler’s request differently.
Verify requests in logs or CDN analytics
Search origin or edge logs for the relevant bot identifier, requested path, timestamp, and response status. Review redirects, challenges, errors, and successful responses instead of treating a request count as proof that every page was reachable.
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For identity checks, compare user-agent information with the operator’s current published IP data or verified CDN telemetry. Perplexity specifically recommends combining user-agent matching with its published IP ranges for WAF rules and reviewing logs after changes. See Perplexity’s crawler guidance.
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If your site uses Cloudflare, its AI Crawl Control analytics can show crawler request totals, successful and unsuccessful requests, and response-code distributions for that Cloudflare zone. These views describe traffic handled by that zone; they are not a monitor for unrelated hosting or CDN providers. Cloudflare: Analyze AI traffic.
Check CDN and WAF rules for a second layer of blocking
A permissive robots.txt does not override authentication, firewall rules, bot protections, or rate limits. Review the configuration at your host, CDN, and WAF, especially rules that challenge or block automated requests.
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Also inspect how the edge serves robots.txt. Cloudflare documents that its managed robots.txt feature may prepend directives to an existing file or generate a file with AI-crawler disallow rules when no file exists. Check the public response rather than assuming your repository copy is the one bots see. Cloudflare: robots.txt setting.
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After changing a robots.txt rule or network policy, check the public file and page response again, then monitor logs for new requests and their outcomes. OpenAI says search systems may take about 24 hours to reflect robots.txt updates; Perplexity says changes may take up to 24 hours. These are service-specific expectations, not a universal propagation guarantee. OpenAI crawler documentation; Perplexity crawler documentation.
Even a confirmed successful fetch does not establish that a service indexed the page, showed it in search, cited it, or used it for model training. Site owners can verify policy and network access; a page’s later treatment by an AI service is a separate question. If you need to prevent access rather than request that a crawler stay away, use authentication or server, CDN, or WAF controls.
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