GPTBot
IP prefix list published at openai.com/gptbot.json (authoritative for allowlisting).
OpenAI
OpenAI publishes IP prefix lists for GPTBot, OAI-SearchBot, and ChatGPT-User at openai.com (gptbot.json, searchbot.json, chatgpt-user.json). Those feeds are authoritative for allowlisting.
Autonomous systems
BGP & cloud context
Published prefix lists are authoritative for each bot product; WHOIS may still show Azure or other cloud ASNs. Combine published prefixes with rDNS and OpenAI’s docs.
Third-party hosting & clouds
Microsoft Azure
AS8075AS12076
Common Azure ASNs; align enforcement with OpenAI’s published prefix list.
Published ranges
Official documentation and feeds for each product—open the links for current ranges and verification guidance.
OAI-SearchBot
IP prefix list published at openai.com/searchbot.json (authoritative for allowlisting).
Official sources
ChatGPT-User
IP prefix list published at openai.com/chatgpt-user.json (authoritative for allowlisting).