As the notification from Redhat: https://access.redhat.com/articles/6999582.
Customers using Artifactory (in a restricted environment) and pointing to Docker Remote Repository URL registry.redhat.io and registry.access.redhat.com. The filesystem blobs will be served from Quay.io instead of registry.redhat.io and registry.access.redhat.com registries from May 1st, 2023.
To avoid problems pulling container images, you will need to allow outbound TCP connections (ports 80 and 443) to these hostnames:
cdn.quay.io
cdn01.quay.io
cdn02.quay.io
cdn03.quay.io
You can continue downloading images from registry.redhat.io and registry.access.redhat.com after this update. You do not require a Quay.io login or to engage in any direct interaction with the Quay.io registry to download images from registry.redhat.io and registry.access.redhat.com