Why does a non-delegated sub-domain work?

John Wingenbach bind at wingenbach.org
Mon May 7 17:23:30 UTC 2012

s6 is a subdomain of the parent domain.  Unless otherwise specified, 
subdomains are mastered (NS'd) by the parent (or extended parent domain) 
containing NS records.  As such, because you didn't put any NS records 
in the zone file for s6, it follows the NS records of the parent which 
happen to be the same name server as s6.  On the other hand, if you had 
attempted to master s6 on a different name server, it would not have worked.

On 05/07/2012 12:32 PM, M. Meadows wrote:
> So ... if we have
> exacttarget.com delegated to ns1 and ns2.exacttarget.com nameservers
> and ... we manage the s6.exacttarget.com zone file from ns1 and 
> ns2.exacttarget.com
> but we don't delegate s6 in the exacttarget.com zone file ... forgot 
> to enter it in the zone file ...
> how is it that s6.exacttarget.com and its contents resolve properly 
> from everywhere?
> Seems BIND is helping us out behind the scenes somehow. Right?
> Confused.
> Thanks,
> Marty
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