The literal root .substack is not in the current IANA delegation list
The literal root .substack is not in the current IANA delegation list. The comparison may still show observed renewal or transfer information for existing names.
Compare any listed renewal and transfer prices for an existing .substack name. Those operations remain separate from the namespace’s restriction on new registrations; a historical registration tariff does not reopen registration.
Review the registry DNSSEC fields and the chosen registrar’s documented DNSSEC feature. The available data does not establish an individual-domain DNSSEC workflow for .substack.