Oh, the games people play now. Every night and every day now. Never meaning what they say now. Never saying what they mean. And they wile away the hours. In their ivory towers. Till they're covered up with flowers.
ZoneCheck performs several tests on your DNS zone to ensure that it is correctly configured, and can be safely delegated. The Zone name must be either a Domain name, in-addr.arpa zone, or ip6.arpa zone name.
The authority over each DNS zone is delegated to a legal entity or organization (i.e. a country-code top-level domain registry) or a company/individual registered to use a certain sub-domain within the system.