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. This has resulted in incompatible implementations and unexpected results when they are used.
... Software Consortium produced a version of the BIND DNS software that can be configured by system administrators to filter out wildcard DNS records from ... Other DNS server programs have followed suit, providing the ability to ignore wildcard DNS records as configured ...
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I have no name:
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