What it does
Amzn-User is Amazon's user action crawler. A live fetch made because a human asked the assistant about your page right now. Closest thing to a real visitor; several of these (Perplexity-User, meta-externalfetcher) ignore robots.txt by design because the request is user-initiated.
User-initiated fetches for Amazon AI experiences.
Full UA: not captured in our July 2026 roster review — match log hits on the token Amzn-User (case-insensitive substring) and verify by IP before acting.
How to verify a hit is really Amzn-User
Verification method (July 2026): Published IP list page: https://developer.amazon.com/amazonbot/live-ip-addresses/
User-agent strings are freely spoofed, so a UA match alone proves nothing. Confirm the source IP belongs to Amazon — published IP-range JSON where available, otherwise RDAP/rDNS on the IP. Full method: verify by IP.
Allow or block in robots.txt
Match the exact token Amzn-User in robots.txt:
# Block Amzn-User site-wide
User-agent: Amzn-User
Disallow: /# Explicitly allow Amzn-User
User-agent: Amzn-User
Allow: /For the allow-search-block-training combined pattern (and the Allow-directive gotcha that silently kills carve-outs), see the robots.txt guide.
Vendor documentation: https://developer.amazon.com/amazonbot
Frequently asked questions
What is Amzn-User?
Amzn-User is Amazon's user action crawler. A live fetch made because a human asked the assistant about your page right now. Closest thing to a real visitor; several of these (Perplexity-User, meta-externalfetcher) ignore robots.txt by design because the request is user-initiated.
Does Amzn-User respect robots.txt?
Amazon claims Amzn-User respects robots.txt, but compliance is not independently confirmed.
How do I block Amzn-User?
Add 'User-agent: Amzn-User' followed by 'Disallow: /' to your robots.txt. Use the exact token — substring variants of other tokens will not match.