Anthropic

Official

Anthropic documents fixed addresses for Claude API and Console traffic, and publishes a JSON feed of crawler prefixes for ClaudeBot, Claude-User, and Claude-SearchBot.

Claude API & Console IP addresses

Official feed

https://platform.claude.com/docs/en/api/ip-addresses

Web crawlers (ClaudeBot, Claude-User, Claude-SearchBot)

Official feed

Use robots.txt for crawl policy; confirm crawler source IPs against this feed.

https://claude.com/crawling/bots.json

Documentation

Anthropic Help - web crawling & blocking