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.
Read more about Wildcard DNS Record: Definitions of DNS Wildcards, Example Wildcard Usages, Wildcards in Practice, Registries/ISPs That Employ Wildcards, Ignoring Wildcards Employed By Others
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