Free Subdomains

Some services hand out subdomains of their own domain to the public, for free: dynamic DNS providers like duckdns.org and free subdomain services like us.kg. Unlike an ordinary subdomain, which belongs to whoever owns the parent domain, each name under one of these namespaces is controlled by a different, unrelated person, and new ones can be created instantly.

free_subdomain is true when the domain sits under one of these namespaces. The parent domain itself is not flagged: it's an ordinary registered domain, owned and controlled by the service operator; only the names beneath it are given away.

The field is returned by the domain and email endpoints, and is available in Gates as domain.free_subdomain.

Examples

Domain	free_subdomain	Why
alice.duckdns.org	true	A name handed out under the duckdns.org dynamic DNS service
duckdns.org	false	The operator's own registered domain, not a handed-out name
myapp.us.kg	true	A name handed out under a free subdomain service
github.com	false	An ordinary registered domain

Relationship to disposable domains

free_subdomain and disposable are independent: a free subdomain is not necessarily disposable, and a domain can be both.