Wildcards

Something else we haven't covered yet is DNS wildcards. At times you want a single resource record to cover any possible name, rather than creating zillions of resource records that are all the same except for the domain name to which they apply. DNS reserves a special character, the asterisk (*), to be used in a DNS datafile as a wildcard name. It will match any number of labels in a name, as long as that name isn't an exact match with a name already in the DNS database. Most often, you'd use...