Thursday, September 19, 2013

Wildcard DNS record / any subdomain resolve one IP (wilcard)

A wildcard DNS record in a zone file looks similar to this example:

MX                                  IN   A
mail                                 IN   A

*    IN   CNAME
(this will be  refer to IP


*   3600 IN  MX 10

This wildcard DNS record will cause DNS lookups on domain names ending in that
do not exist to have MX records synthesized for them.
So, any lookup for the MX record for would return an MX record pointing to

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