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.
A wildcard DNS record is a record in a DNS zone that will match requests for non-existent domain names. A wildcard DNS record is specified by using a * as the leftmost label (part) of a domain name, e.g. *.example.com. The exact rules for when a wild card will match are specified in RFC 1034, but the rules are neither intuitive nor clearly specified.