[dns-operations] aws.amazon.com zone has only one nameserver

[Mark Jeftovic]

I believe this is the entire set:

$ dig +trace aws.amazon.com

[snip]

aws.amazon.com.         7200    IN      NS      ns-932.amazon.com.
aws.amazon.com.         7200    IN      NS      ns-923.amazon.com.
aws.amazon.com.         7200    IN      NS      ns-931.amazon.com.
aws.amazon.com.         7200    IN      NS      ns-912.amazon.com.
aws.amazon.com.         7200    IN      NS      ns-921.amazon.com.
aws.amazon.com.         7200    IN      NS      ns-911.amazon.com.
;; Received 261 bytes from 204.74.108.1#53(pdns1.ultradns.net) in 170 ms


but each nameserver is only returning it's own RR (I think)

- mark

On 2015-12-08 7:35 AM, Valentin Bud wrote:
> Hello Yonghua,
> 
> Fom where I am standing (.ro) things look differently, as it follows.
> 
>  ~$ dig +short aws.amazon.com <http://aws.amazon.com> ns in
> ns-932.amazon.com <http://ns-932.amazon.com>.
> 
> ~$ dig +short ns-932.amazon.com <http://ns-932.amazon.com>. a in
> 52.16.221.207
> 
> I guess that Amazon has geo aware DNS configuration in place.
> 
> Also I can find the A IN for ns-911.amazon.com
> <http://ns-911.amazon.com/> and it matches yours.
> 
> ~$ dig +short ns-911.amazon.com <http://ns-911.amazon.com>. a in
> 207.171.178.6
> 
> Best,
> Valentin
> 
> On Tue, Dec 8, 2015 at 2:10 PM Yonghua Peng <pyh at cloud-china.org
> <mailto:pyh at cloud-china.org>> wrote:
> 
>     Hi,
> 
>     As you see,
> 
>     ~$ idig aws.amazon.com <http://aws.amazon.com> ns
>     aws.amazon.com <http://aws.amazon.com>.         587     IN      NS 
>         ns-911.amazon.com <http://ns-911.amazon.com>.
> 
>     ~$ idig aws.amazon.com <http://aws.amazon.com> soa
>     aws.amazon.com <http://aws.amazon.com>.         60      IN      SOA 
>        ns-911.amazon.com <http://ns-911.amazon.com>.
>     root.amazon.com <http://root.amazon.com>. 1449536989 3600 900 7776000 60
> 
>     ~$ idig ns-911.amazon.com <http://ns-911.amazon.com>
>     ns-911.amazon.com <http://ns-911.amazon.com>.      197     IN     
>     A       207.171.178.6
> 
>     Do you know why this well known domain has only one nameserver, and it
>     seems the nameserver has only one IP?
> 
>     Thx.
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-- 
Mark Jeftovic, Founder & CEO, easyDNS Technologies Inc.
Company Website: http://easydns.com
Read my blog: http://markable.com
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