Amzn-User
Amazon · User fetch · robots.txt: Not always
Fetches live information from the web on a user's behalf, for example to answer an Alexa question that needs up-to-date information.
Block Amzn-User
User-agent: Amzn-User
Disallow: /A Disallow line may not fully stop Amzn-User, because Amazon says it may not follow all robots.txt directives. Amazon says it does not crawl content for model training.
Allow Amzn-User
User-agent: Amzn-User
Allow: /An allow group only changes anything if a broader rule would block Amzn-User. Under the robots.txt standard (RFC 9309, section 2.2.1) a crawler follows the group that names it and uses the User-agent: * group only when no group does — so this group lets it in even if your * group says Disallow: /. Token matching is case-insensitive.
Put these lines in /robots.txt at the root of each host (each subdomain has its own file). robots.txt is a request to well-behaved crawlers, not access control.
Facts
- Operator
- Amazon
- Purpose
- User-requested fetch
- Obeys robots.txt
- Not always. Amazon says that because Amzn-User's actions can be initiated by a user, it may not follow all robots.txt directives.
- In your server logs
- The user-agent string contains "Amzn-User/0.1".
- How to verify it
- Match the request's IP address against Amazon's published Amzn-User IP list.
Published list: developer.amazon.com/amazonbot/live-ip-addresses/ — 1023 IPv4 ranges when we fetched it, list dated 4 Nov 2025. Always match against the live list; operators update them.
What Amazon says
Quoted word for word from the operator's documentation.
“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. Because actions taken by Amzn-User can be initiated by a user, it may not follow all robots.txt directives.Amzn-User does not crawl content for generative AI model training.”
“Example User Agent String: Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Amzn-User/0.1) Chrome/W.X.Y.Z Safari/537.36”
“Published IP Addresses:”
Sources
- Amazon Developer: About Amazonbot — fetched and checked 2026-09-22
- Amazon Developer: Amzn-User IP addresses — fetched and checked 2026-09-22