authoritative rDNS

Barry Margolin barmar at
Thu Oct 10 06:54:13 UTC 2013

In article <mailman.1483.1381387501.20661.bind-users at>,
 Jim Pazarena <bind at> wrote:

> I set up a subnet on my server, complete with rdns, and ARIN has been 
> adjusted for my two dns servers ( &
> the subnet:
> if you do a lookup of, for instance:
> and bounce that nslookup off of other dns servers, SOME say:
> Authoritative answers can be found from: <ns & ns2>
> others, well, at least google do not show anything as
> authoritative, altho the IP DOES resolve.
> I am curious if isn't trying, or instead, am I missing
> something which considers incomplete and therefore 
> un-authoritative ?
> I just want to make sure my setup is accurate. Thanks.

Including the Authority Section in a response is optional (unless it's a 
delegation or negative response). If you ask them explicitly for the NS 
records they show it:

$ dig @ -x 23.235.75 ns

;; ANSWER SECTION: 21600 IN NS 21600 IN NS

Barry Margolin
Arlington, MA

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