They used to use AWS CloudFront and switched to Fastly, someone shared this in another comment:

[https://www.streamingmediablog.com/2020/05/fastly-amazon-hom...: CDN Fastly Wins Content Delivery Business For Amazon.com and IMDB Websites)

Quoting:

> "But with small object delivery, like images loading fast on Amazon’s home page, it’s the opposite. Customers will pay for a better level of performance and in this case, Fastly clearly outperformed Amazon’s own CDN CloudFront. This isn’t too surprising since CloudFront’s strength isn’t web performance, or even live streaming, but rather on-demand delivery of video and downloads."

Amazon (like a lot of others) use several CDNs for redundancy. You can see from dig that it resolves to combinations of cloudfront, akamai, and (presumably, based on your reported experience) fastly.

  dig +short www.amazon.com
  tp.47cf2c8c9-frontier.amazon.com.
  d3ag4hukkh62yn.cloudfront.net.
  65.8.70.16

  dig +short www.amazon.co.uk
  tp.bfbdc3ca1-frontier.amazon.co.uk.
  dmv2chczz9u6u.cloudfront.net.
  13.224.0.89

  dig +short www.amazon.in
  tp.c95e7e602-frontier.amazon.in.
  d1elgm1ww0d6wo.cloudfront.net.
  13.224.9.30

  dig +short www.amazon.co.jp
  tp.4d5ad1d2b-frontier.amazon.co.jp.
  www.amazon.co.jp.edgekey.net.
  e15312.a.akamaiedge.net.
  104.71.134.162