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robots.txt of wikipedia.org.

See which search engines and AI crawlers may fetch a page, and the exact line of robots.txt that decides it.

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How the rules are read.

  • A crawler looks for groups with its own name in User-agent:, case does not matter, and combines them; with none, it uses the * group.
  • Of the Allow: and Disallow: lines that match the path, the longest wins. A tie goes to Allow. * matches any run of characters and $ the end of the address.
  • No file (404) means everything may be fetched; a server error (5xx) means crawlers treat everything as blocked. /robots.txt itself is always allowed.

AI crawlers, by what they do.

  • Training: GPTBot (OpenAI), ClaudeBot (Anthropic), Google-Extended (Gemini), CCBot (Common Crawl), Applebot-Extended. Blocking them asks that your pages not be used to train models.
  • Search: OAI-SearchBot, Claude-SearchBot, PerplexityBot. Blocking them can keep your site out of those assistants' answers.
  • On a user's request: ChatGPT-User and Claude-User fetch a page someone asked about; OpenAI notes robots.txt may not apply to those.

Blocked is not hidden.

robots.txt stops crawling, not indexing: a blocked page can still show in search results, without a description, if other pages link to it. To keep a page out of results, let it be crawled and add noindex. Never rely on robots.txt for anything private; the file itself is public.

Questions people ask.

How does robots.txt decide whether a page is blocked?

A crawler uses the group for its own name, or the * group if it has none. Of the Allow and Disallow lines that match the path, the longest one wins; when an Allow and a Disallow are equally long, Allow wins (RFC 9309).

How do I block AI crawlers but keep Google?

Give each AI crawler its own group with Disallow: /, for example User-agent: GPTBot, User-agent: ClaudeBot, User-agent: Google-Extended, User-agent: CCBot. Googlebot keeps following its own rules, so search is unaffected.

Does Disallow keep a page out of Google?

No. It stops crawling, but a blocked page can still appear in results if other sites link to it. To keep a page out, allow crawling and add a noindex meta tag or header.

What happens if robots.txt is missing or broken?

A missing file (404) means crawlers may fetch everything. A server error (5xx) makes crawlers treat the whole site as blocked until it is fixed.

Is there a size limit?

Crawlers must read at least 500 KiB, and Google stops there: rules further down are ignored.

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Sources

  1. RFC 9309: Robots Exclusion Protocol
  2. OpenAI: overview of OpenAI crawlers
  3. Anthropic: how site owners can block Anthropic's crawlers
  4. Google Search Central: how Google interprets robots.txt

By Hivex. Updated 10 October 2026. Addresses are fetched live from Hivex's servers; page contents are never read or stored.