AI crawlers · Training crawlers
ClaudeBot
ClaudeBot is the training crawler run by Anthropic: Anthropic training. Its operator publishes the IP ranges it crawls from (https://claude.com/crawling/bots.json), so a request carrying the name can be checked against that list.
| User-agent token | ClaudeBot |
| Operator | Anthropic |
| What it does | Anthropic training |
| Kind | training crawler |
| Can a request be verified? | Yes — published ip feed |
| Verification source | https://claude.com/crawling/bots.json |
| In a CrawlCheck scan | Sent as a request on every scan; reported, never scored |
Allow or block it in robots.txt
User-agent: ClaudeBot Disallow: /
User-agent: ClaudeBot Allow: /
Add a group that names it: "User-agent: ClaudeBot" followed by "Disallow: /". A crawler follows only the most specific group that names it, so once a group names ClaudeBot, rules under "User-agent: *" no longer apply to it; repeat in that group any Disallow lines you still want.
What blocking it changes
No. It collects pages for training. Refusing it is a policy choice about training, separate from whether answer engines can reach, read and quote the site.
What it actually did on crawlcheck.io
| Verified requests | 7,462 |
| Requests using its name from outside its operator's ranges | 92 (1.2% of claims) |
| robots.txt fetched | 227 times |
| Fetches of paths robots.txt disallows | 3 |
| Observed | 2026-08-13 to 2026-10-30 |
Measured on this site’s own traffic, verified against the operator’s published ranges. Every agent’s record: agent conduct.
Other agents from Anthropic
Claude-SearchBot— Claude search indexClaude-User— Claude live fetchanthropic-ai— Anthropic legacy agentClaude-Web— Anthropic legacy agent
See what ClaudeBot and every other named agent receive from your own site: run a free scan. The full catalogue is on AI crawlers and as JSON at /ai-crawlers.json.