CNAME flattening

A DNS zone's apex (the bare domain, e.g. example.com.) can't hold a CNAME record alongside the SOA and NS records it also needs — a DNS protocol constraint that applies everywhere. Plenty of targets you don't control — CDNs, SaaS platforms, managed load balancers — only ever give you a CNAME, never a fixed IP address.

CNAME flattening resolves that: CNX looks up the CNAME target on your behalf and publishes the resulting A/AAAA records directly at the name you want, kept in sync as the target's own IPs and TTL change. See Setting up aliases.yml for how to configure it.