Claude-Web
Claude-Web is a bot operated by Anthropic that browses the web on its own to finish multi-step tasks. Claude-Web is an AI-related agent operated by Anthropic. Whether it honours robots.txt is undocumented, and a request claiming to be Claude-Web can be checked against a published IP range file.
Claude-Web at a glance
| User agent | Claude-WebToken only. The operator has not published a full user-agent string, so match on the substring rather than an exact header. |
|---|---|
| Operator | Anthropic |
| Purpose | Autonomous agents |
| Respects robots.txt | Not documented |
| Verification method | Published IP range file A legacy token that predates the current ClaudeBot naming. Site owners still see it in old logs and old robots.txt files; check the published prefix file before trusting it. https://claude.com/crawling/bots.json |
| Crawl pattern | Not published |
| Robots.txt tokens | Claude-Web |
| Operator documentation | https://support.claude.com/en/articles/8896518-does-anthropic-crawl-data-from-the-web-and-how-can-site-owners-block-the-crawler |
Claude-Web is an AI-related agent operated by Anthropic. It's currently unclear exactly what it's used for, since there's no official documentation. If you can provide more detail, please contact us.
Allow or block Claude-Web
Paste one of these into the robots.txt file at the root of your domain. Rules are per token, so a block on one crawler leaves every other bot untouched.
User-agent: Claude-Web
Disallow: /Blocks every path for this crawler only.
User-agent: Claude-Web
Allow: /Explicit allow. Useful when a wildcard rule above it would otherwise catch this crawler.
User-agent: Claude-Web
Allow: /
Disallow: /account/
Disallow: /checkout/
Disallow: /searchEdit the Disallow paths to match your own account, checkout and search URLs.
What blocking actually costs you
Blocking Claude-Web stops automated sessions that fill forms, click through flows and read pages the way a logged-in user would. Rate limits and challenges usually work better here than a robots.txt line.
Block every crawler in the directory at onceIs that really Claude-Web?
A user-agent header is a string the client chooses. Scrapers copy Claude-Web precisely because site owners allow it. A legacy token that predates the current ClaudeBot naming. Site owners still see it in old logs and old robots.txt files; check the published prefix file before trusting it.
Paste the IP address from your access log below. You will see whether it belongs to a hosting provider, a residential proxy pool or a Tor exit, plus the ASN that announces it, which is what tells you whether the claim holds up.
Other crawlers run by Anthropic
Related crawlers
Identify crawlers automatically instead of by hand
Agentscan checks a request against published crawler ranges, reverse DNS and hosting data, then returns a verdict your edge can act on. One call per request, no range files to keep up to date.