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Amazon CloudFront now provides viewer ISP and post-quantum TLS details

Published
October 30, 2026
https://aws.amazon.com/about-aws/whats-new/2026/10/cloudfront-viewer-isp-post-quantum-visbility/

Amazon CloudFront Updates

Amazon CloudFront now supports forwarding two new optional headers to your origin: CloudFront-Viewer-ISP and CloudFront-Viewer-TLS-Details. These headers provide visibility into the viewer's network and TLS connection details, respectively.

CloudFront-Viewer-ISP

This header contains the name of the viewer's internet service provider (ISP), allowing you to analyze traffic and performance by network and isolate unusual traffic from a single provider.

CloudFront-Viewer-TLS-Details

This header includes the key exchange, signature scheme, and signature public key type for each connection, enabling you to measure the share of viewers using post-quantum cryptography (PQC) and identify clients that do not yet use it.

What to do

  • Add the desired headers to an origin request policy.
  • Attach the policy to your CloudFront distribution.

Source: AWS release notes




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