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NCBI www.ncbi.nlm.nih.gov · public-data

What it says about automated access

We found no statement about automated access in what we read.

robots.txt https://www.ncbi.nlm.nih.gov/robots.txt read 2026-10-03

AgentRules it follows (RFC 9309)Over the whole file
*the * group74 Disallow rules; / allowed
Googlebotits own group50 Disallow rules; / allowed; not bound by 36 of the * Disallow rules
Bingbotits own group43 Disallow rules; / allowed; not bound by 34 of the * Disallow rules

With no group of their own, these follow the * group: GPTBot, OAI-SearchBot, ChatGPT-User, ClaudeBot, Claude-SearchBot, Claude-User, Google-Extended, Applebot-Extended, PerplexityBot, CCBot, Bytespider, meta-externalagent.

Under RFC 9309 an agent with its own group follows only that group, so the * rules do not apply to it.

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