ClaudeBot

Anthropic's crawler that collects web pages to train AI models.

In robots.txt: User-agent: ClaudeBot

Named by11.7%of readable robots.txt files on the top 1M (70,491 of 600,979)

Of those, block it71.5%shut it out of the whole site (50,436 of 70,491)

Same sites, since CC-MAIN-2026-34−0.6 ptsshare of the same 394,690 sites that block it by name: 9.2% → 8.6%

Via Cloudflare's file53.4%of its blocks come from Cloudflare's ready-made robots.txt (26,941 of 50,436)Cloudflare stopped adding that file on 16 September 2026, so this month mixes before and after. What happened

71.5%

14.0%

14.5%

Block the whole site: 50,436Block some paths: 9,866Name it but allow it: 10,189

Every robots.txt file on the top 1M that names ClaudeBot, by what the rules that apply to it say.

Anthropic's other bots

Sites often treat one company's bots differently, depending on what each is for.

Bot	Purpose	Files naming it	Of those, block it
anthropic-ai	Purpose not documented	28,018	62.2%
claude-web	Fetches a page for a chatbot user	21,076	65.7%
Claude-SearchBot	Builds an AI search index	10,987	36.2%
Claude-User	Fetches a page for a chatbot user	9,951	32.9%

Who does what

The highest-ranked sites on the top million in each group. Click one to see its whole robots.txt verdict.

Block it

Block some paths

Name it and allow it

Lists skip sites we don't showcase (adult content).

What this means for you: blocking ClaudeBot asks Anthropic not to collect your pages for AI training from now on. robots.txt only affects future visits, and it doesn't touch Anthropic's other bots. Decide each bot on what it's for, not who runs it.