AI bots

Claude-User: what it is, its IP ranges, and how to block it

Claude-User is Anthropic's crawler for AI search and answers.

Vendor	Anthropic
What it is for	AI search and answers
In its User-Agent	`Claude-User`
Its vendor's address list	`https://claude.com/crawling/bots.json`
IP ranges	14

It reads a page for an AI's search or for a person who asked an assistant, and can bring visitors. Bot Protection lets it through by default; you can block it.

How to verify it

Any bot can write Claude-User in its User-Agent. A request is Claude-User only when its address is in Anthropic's published list below: check the address, not the name.

Check an address

How to block it

With robots.txt, you ask it to stay out:

User-agent: Claude-User
Disallow: /

robots.txt is a request, not a block, and it cannot tell the real crawler from a bot wearing its name. Bot Protection verifies Claude-User by its address on every request and answers it as you choose on the Set-up page, per kind or for Claude-User alone; a bot that only wears the name is judged like any other bot.

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Its IP ranges

From Anthropic's own list, downloaded again every day.

IPv4

216.73.216.0/22
34.162.230.222/32
34.162.244.71/32
34.162.191.81/32
34.162.86.102/32
136.79.143.251/32
136.83.20.215/32
34.162.111.78/32
34.162.90.102/32
34.162.27.34/32
34.152.124.140/32
34.153.21.190/32
34.186.252.4/32
34.162.153.71/32