View Full Version : What is wildcard DNS?

09-22-2013, 03:55 AM
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 :cool:resulted in incompatible implementations and unexpected results when they are used.