AI companies
CompanyTo train its modelsTo answer people and search
- OpenAIChatGPTTo train its modelsKept out
GPTBotline 404To answer people and searchLet inOAI-SearchBotChatGPT-User - AnthropicClaudeTo train its modelsPartly
ClaudeBotline 374, kept outanthropic-ailine 353, kept outClaude-Weblet inTo answer people and searchLet inClaude-SearchBotClaude-User - GoogleGeminiTo train its modelsLet in
Google-ExtendedTo answer people and searchLet inGoogle-CloudVertexBot - PerplexityTo train its modelsNone namedTo answer people and searchLet in
PerplexityBotPerplexity-User - MetaMeta AITo train its modelsKept out
meta-externalagentline 428FacebookBotline 398To answer people and searchLet inmeta-externalfetchermeta-webindexer - AppleApple IntelligenceTo train its modelsKept out
Applebot-Extendedline 362To answer people and searchNone named - AmazonTo train its modelsKept out
Amazonbotline 350To answer people and searchLet inAmzn-SearchBotAmzn-User - Common Crawlopen data for trainingTo train its modelsKept out
CCBotline 368To answer people and searchNone named - ByteDanceTo train its modelsPartly
Bytespiderline 365, kept outTikTokSpiderlet inTo answer people and searchNone named - MistralLe ChatTo train its modelsNone namedTo answer people and searchLet in
MistralAI-User
19 of the 27 other AI crawlers we know are kept out: cohere-ai, cohere-training-data-crawler, Diffbot, Omgilibot, Omgili and 14 more.
What it tells AI crawlers
It gives no Content Signals and no “noai” tag.
Like 32% of the 1,691 popular sites whose robots.txt we read in October 2026, it keeps at least one AI training crawler out. How many websites block AI crawlers?
We read the site once, as our named bot: its robots.txt, read as crawlers read it, its home page and the files AI tools ask sites for. What we couldn’t read says so. robots.txt asks and doesn’t enforce: a firewall can treat AI crawlers differently from us.