OpenAI
OpenAI publishes IP prefix lists for GPTBot, OAI-SearchBot, ChatGPT-User, and OAI-AdsBot, plus ChatGPT connectors (plugins/Actions) and ChatGPT agents / Codex cloud egress feeds at openai.com. Those feeds are authoritative for allowlisting; prefer request auth (mTLS/OAuth) where OpenAI documents it.
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
Common Azure ASNs; align enforcement with OpenAI’s published prefix list.
Published ranges
GPTBot
Official feedIP prefix list published at openai.com/gptbot.json (authoritative for allowlisting).
OAI-SearchBot
Official feedIP prefix list published at openai.com/searchbot.json (authoritative for allowlisting).
ChatGPT-User
Official feedIP prefix list published at openai.com/chatgpt-user.json (authoritative for allowlisting).
OAI-AdsBot
Official feedIP prefix list published at openai.com/adsbot.json for ChatGPT ads landing-page validation (authoritative for allowlisting).
ChatGPT connectors
Official feedEgress prefixes for ChatGPT plugins, connectors, GPT Actions, and agentic commerce (openai.com/chatgpt-connectors.json).
ChatGPT agents / Codex cloud
Official feedEgress prefixes for Codex cloud and related ChatGPT agent connections (openai.com/chatgpt-agents.json).