Moderated Domains

Some domain names cannot be registered normally and require a special registration process, these are also sometimes called restricted domains.

TLD	Description
.cri.nz	Crown Research Institutes
.govt.nz	National, regional and local government organisations operating with statutory powers. The government registrar, DNS.govt.nz controls registration; a government portal operates at www.govt.nz
.health.nz	Health organisations
.iwi.nz	Traditional Māori tribes, hapū, or Taura here groups. Can only be registered by the DNC but then can be transferred and managed by any registrar.
.mil.nz	The military organisation of the New Zealand government, the New Zealand Defence Force
.parliament.nz	Reserved for parliamentary agencies, offices of parliament, and parliamentary political parties and their elected members

For more details please see the link below