AI crawler · Amazon · Fetches when a user asks
Amzn-User: what it is, its user agent, and how to block it
Amzn-User is Amazon's fetcher for user requests. Fetches live pages when a user asks, for example to answer an Alexa question. Not used to train generative AI. In our 13 October 2026 study, 113 of 2,332 live top sites with readable robots.txt rules (4.8%) disallow Amzn-User. Part of the AI crawler list.
What Amzn-User does
Operator: Amazon. Job: Fetches when a user asks. Partly obeys robots.txt.
“Because actions taken by Amzn-User can be initiated by a user, it may not follow all robots.txt directives.”
Amzn-User user agent
robots.txt token: Amzn-User (matched case-insensitively).
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Amzn-User/0.1) Chrome/W.X.Y.Z Safari/537.36Amazon gives this as an example.
robots.txt: allow or block Amzn-User
Allow
User-agent: Amzn-User
Allow: /Block
User-agent: Amzn-User
Disallow: /Affects AI answers and citations. Blocking it refuses the fetch Amazon makes when a user asks its assistant to read your page. Amazon says robots.txt may not apply to these user-triggered fetches, so a Disallow may change nothing.
Once a group names Amzn-User, it ignores your User-agent: * rules, so copy any paths you still want blocked into it.
How many top sites block Amzn-User
Disallow Amzn-User in robots.txt
4.8%
113 of 2,332 sites
In our 13 October 2026 study, 113 of 2,332 live top sites with readable robots.txt rules (4.8%) disallow Amzn-User.
Sample: Tranco top 5,000, tested once on 13 October 2026 from one Indian fixed-line connection. The robots.txt share counts live sites (home page 2xx) whose rules we could read, as on the AI visibility hub. Method and CSV in the study.
Check your own site
The AI crawler checker reads your robots.txt the way Amzn-User does and tests what your firewall returns. To write the rules, use the AI robots.txt generator.
Check your page: free, about 20 seconds, no sign-in
What it checks
- robots.txt for Amzn-User
- Finds the group Amzn-User obeys under RFC 9309 and the rule that decides your page.
- What your CDN lets through
- Requests the page as OAI-SearchBot, PerplexityBot and Claude-SearchBot and compares the answers with a browser request.
- Content without JavaScript
- AI crawlers don't run JavaScript. The audit checks how much of the page is in the raw HTML.
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Questions
What is Amzn-User?+
Amzn-User is Amazon's fetcher for user requests. Fetches live pages when a user asks, for example to answer an Alexa question. Not used to train generative AI.
What is Amzn-User's user agent?+
Amazon documents it as: Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Amzn-User/0.1) Chrome/W.X.Y.Z Safari/537.36. Match on the token Amzn-User, since version numbers change.
How do I block Amzn-User?+
Add "User-agent: Amzn-User" followed by "Disallow: /" to your robots.txt. Partly obeys robots.txt, per Amazon.
Does blocking Amzn-User affect AI search citations?+
Blocking it refuses the fetch Amazon makes when a user asks its assistant to read your page. Amazon says robots.txt may not apply to these user-triggered fetches, so a Disallow may change nothing.
How many websites block Amzn-User?+
In our 13 October 2026 study, 113 of 2,332 live top sites with readable robots.txt rules (4.8%) disallow Amzn-User.