Check the CNAME (alias) records for any hostname.
A CNAME points one name at another, so the alias inherits whatever the target resolves to. It's commonly used to point subdomains at a CDN, app platform, or another domain you control.
Related: DNS lookup, NS lookup, and reverse DNS.
A CNAME (canonical name) record points one hostname to another, acting as an alias. For example, www.example.com might be a CNAME to example.com.
Generally no. The root (apex) domain can't use a plain CNAME because it needs other records like NS and SOA. Many DNS providers offer 'CNAME flattening' or ALIAS records to work around this.
CNAMEs make it easy to point subdomains at a service (like a CDN or app host) without hardcoding IP addresses, so the target can change without you updating your DNS.