Amzn-User: what it is and how to block it

Operator

Amazon

Type

User-triggered

robots.txt token

Amzn-User

Follows robots.txt

Partly, per Amazon

IP ranges

Published

Blocked by name

1.3% of top sites

What is Amzn-User?

Amzn-User is Amazon's user-triggered crawler: it fetches a page when a user asks an AI assistant to. In Amazon's words:

“Amzn-User supports user actions, such as responding to Alexa queries that require up-to-date information. For example, when a customer asks a question, Amzn-User may fetch live information from the web to provide accurate answers on the user’s behalf.”

“Amzn-User does not crawl content for generative AI model training.”

Amzn-User user agent string

Amazon documents this user agent string for Amzn-User:

Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Amzn-User/0.1) Chrome/W.X.Y.Z Safari/537.36

In robots.txt, use the token Amzn-User, not the full string. Crawlers match on the token, and version numbers in the full string can change.

How many websites block Amzn-User?

In our Oct 8, 2026 check of 817 of the most-visited websites, 1.3% block Amzn-User by name for their whole site (11 sites).

For comparison, 0.1% of the same sites block Googlebot by name. The sites are the top 1,000 origins in the Chrome UX Report for August 2026; see how we measured.

How to block Amzn-User in robots.txt

Add this group to the robots.txt file at the root of your domain to block Amzn-User from your whole site:

User-agent: Amzn-User
Disallow: /

To block only part of your site, list those paths instead:

User-agent: Amzn-User
Disallow: /private/

A group that names Amzn-User replaces your User-agent: * rules for it entirely (RFC 9309). If your catch-all group blocks paths that Amzn-User should also stay out of, repeat them in its group. To let Amzn-User in while a catch-all rule blocks others:

User-agent: *
Disallow: /

User-agent: Amzn-User
Allow: /

Amazon says robots.txt doesn't fully control Amzn-User. To stop it completely, block it at your firewall or CDN using the verification details below.

“Because actions taken by Amzn-User can be initiated by a user, it may not follow all robots.txt directives.”

What happens if you block Amzn-User?

Amazon doesn't document what blocking Amzn-User changes.

How to verify requests from Amzn-User

Amazon publishes the IP addresses Amzn-User uses. Check a request's IP address against that list before trusting its user agent, which any client can fake.

Other Amazon crawlers

• Amazonbot · AI training
• Amzn-SearchBot · Search

See every AI crawler and how often top sites block it