The parent zone TTL would work fine. 

Sent from my iPhone

> On Jul 8, 2019, at 2:02 PM, Michael J. Sheldon <mshel...@godaddy.com> wrote:
> 
> 
> 
>> On 7/8/19 10:56 AM, Paul Vixie wrote:
>> i've always sent back SERVFAIL when the zone isn't loaded, on either a 
>> primary
>> or secondary (authoritative, that is) server. and i cache SERVFAIL on the
>> recursive/iterative side with a holddown timer equal to the negative TTL
>> interval (SOA.MINIMUM).
>> 
>> but i didn't realize that the standard doesn't say to do this, until i read
>> the above.
>> 
>> --
>> Paul
>> 
>> 
> 
> BIND returns REFUSED, so that's what I've always used, for maximum
> consistency/compatibility.
> 
> What SOA.minimum are you returning? Which SOA? And on what record would
> it be returned? The issue is that there is no matching zone.
> 
> -- 
> Michael Sheldon
> Dev-DNS Services
> GoDaddy.com
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