about the wild record

[pangj]

于 2012-10-15 15:38, Cathy Almond 写道:
> On 15/10/12 05:23, pangj wrote:
>> Hello,
>>
>> I have setup a wild record for cloudns.tk, the record:
>>
>> *.cloudns.tk.  300     IN      A       209.141.54.207
>>
>> And I added another A record as this:
>>
>> s1.test.cloudns.tk.     300     IN      A       8.8.8.8
>>
>> After adding this record, the record of test.cloudns.tk gets lost, it
>> does't match the wild record anymore.
>>
>> "dig test.cloudns.tk" gets nothing.
>>
>> Can you help explain it? thanks in advance.
>
> It's subtle.
>
> Wildcards match where there are no labels already.
>
> By adding record s1.test.cloudns.tk, you're implicitly creating domain
> test.cloudns.tk.  It's empty, but it exists.
>

But I didn't define a zone "test.cloudns.tk" (neither NS nor soa defined 
for it), why this domain exists?

Thanks Cathy.