Safe AI & LLM Bots

Amazon User Agent

Operated by Amazon

Quick Facts

User-Agent:
Amzn-User
Category:
AI & LLM Bots
Operator:
Amazon
Safety:
Safe
Blocking Impact:
Low - No SEO ranking impact
SEO Impact Score:
2/10
Official docs:
www.amazon.com

What is Amazon User Agent?

Amazon User Agent is an on-demand AI fetcher operated by Amazon. It retrieves a page only when a user explicitly asks an AI assistant or agent to read, summarize, or act on a specific URL. Because it is triggered by real user intent rather than bulk crawling, blocking it mainly prevents users from pulling your content into Amazon's assistant.

Amazon User Agent is an on-demand AI fetcher operated by Amazon. It retrieves a page only when a user explicitly asks an AI assistant or agent to read, summarize, or act on a specific URL. Because it is triggered by real user intent rather than bulk crawling, blocking it mainly prevents users from pulling your content into Amazon's assistant. Amazon User Agent uses the user-agent token Amzn-User. You can control it via robots.txt, meta tags (noai), or the emerging llms.txt standard. Robots.txt is voluntary; for hard enforcement, combine it with server-level IP blocking.

What happens if you block Amazon User Agent?

✅ **No SEO Impact** - Blocking Amazon User Agent does not affect your rankings in Google, Bing, or any other search engine. Amazon User Agent is an AI crawler, not a traditional search indexer. You can freely block it via User-agent / Disallow: / without any SEO penalty.
Generally safe to allow; provides legitimate crawling value.

How to block Amazon User Agent with robots.txt

<code>User-agent: Amzn-User</code> - Matching is case-insensitive. Robots.txt is fetched from the root of each subdomain separately.

Block completely (robots.txt)
User-agent: Amzn-User Disallow: /
Allow all (robots.txt)
User-agent: Amzn-User Allow: /
Block private only (robots.txt)
User-agent: Amzn-User Disallow: /private/ Disallow: /api/ Disallow: /admin/ Allow: /
Nginx server block
# Nginx: Hard-block Amazon User Agent if ($http_user_agent ~* "Amzn-User") { return 403 "Bot blocked"; }
Apache .htaccess
# Apache: Hard-block Amazon User Agent SetEnvIfNoCase User-Agent "Amzn-User" bad_bot Order Allow,Deny Allow from all Deny from env=bad_bot
Meta robots tag
<meta name="robots" content="noindex, nofollow">
X-Robots-Tag header
X-Robots-Tag: noindex, nofollow

Is Amazon User Agent safe to allow?

Yes, Amazon User Agent is a **safe and legitimate** crawler operated by Amazon. It follows the Robots Exclusion Protocol (RFC 9309) and can be controlled with standard robots.txt rules.
Verify by reverse-DNS lookup: legitimate Amazon User Agent requests resolve to Amazon's domain.

What does Amazon User Agent do?

Understanding Amazon User Agent's purpose helps you decide whether to allow or block it.

  • Fetches a page only when a user asks an AI assistant to read it
  • Summarizes or extracts the URL the user provided
  • Triggered by real user intent, not bulk crawling
  • Low traffic volume compared with training crawlers
  • Blocking it prevents users from pulling your content into the assistant

Frequently Asked Questions

What is the official user-agent string for Amazon User Agent?
The official user-agent string for Amazon User Agent is: Amzn-User. Use this exact string in robots.txt, Nginx, Apache, or Cloudflare firewall rules to target this bot. Matching in robots.txt is case-insensitive. Verify a request genuinely comes from Amazon User Agent by performing a reverse-DNS lookup on the source IP.
Is Amazon User Agent safe?
Yes, Amazon User Agent is a **safe and legitimate** crawler operated by Amazon. It follows the Robots Exclusion Protocol (RFC 9309) and can be controlled with standard robots.txt rules.
Will blocking Amazon User Agent hurt my SEO?
✅ **No SEO Impact** - Blocking Amazon User Agent does not affect your rankings in Google, Bing, or any other search engine. Amazon User Agent is an AI crawler, not a traditional search indexer. You can freely block it via User-agent / Disallow: / without any SEO penalty.
How do I block Amazon User Agent in robots.txt?
Add the following lines to your /robots.txt file: 
User-agent: Amzn-User
Disallow: /
This instructs Amazon User Agent not to crawl any path on your site. To block only specific sections, replace / with the path (e.g., Disallow: /blog/).
Does Amazon User Agent respect robots.txt?
Amazon User Agent is operated by Amazon and is expected to fetch and parse /robots.txt before crawling, following RFC 9309. For hard enforcement, combine robots.txt with server-level IP or user-agent blocking.
How do I verify if Amazon User Agent is crawling my site?
Search your web server access logs for the string Amzn-User (case-insensitive: grep -i "Amzn-User" /var/log/nginx/access.log). Filter by user-agent in your log analytics tool (GoAccess, AWStats, etc.).

Related Bots