DNS Wildcards Myth #1

A common misunderstanding of DNS wildcards:

Given

    *.example.com TXT "blah"
  foo.example.com A 192.0.2.1

Many people think that the wildcard will synthesize

  foo.example.com TXT "blah".

This is, however, not true.

You do get

  bar.example.com TXT "blah"

but you explicitly do not get a TXT record for foo because
foo has an A record.