1. DNS/gTLD/sony

2. sony

%dnsname 37.209.192.9

brand.alpha.aridns.net.au

%dnsname 37.209.198.9

brand.delta.aridns.net.au

%dnsq ns sony a.root-servers.net

2 sony:
266 bytes, 1+0+4+8 records, response, noerror
query: 2 sony
authority: sony 172800 NS a.nic.sony
authority: sony 172800 NS b.nic.sony
authority: sony 172800 NS c.nic.sony
authority: sony 172800 NS d.nic.sony
additional: a.nic.sony 172800 A 37.209.192.9
additional: b.nic.sony 172800 A 37.209.194.9
additional: c.nic.sony 172800 A 37.209.196.9
additional: d.nic.sony 172800 A 37.209.198.9
additional: a.nic.sony 172800 28 \040\001\015\315\000\001\000\000\000\000\000\000\000\000\000\011
additional: b.nic.sony 172800 28 \040\001\015\315\000\002\000\000\000\000\000\000\000\000\000\011
additional: c.nic.sony 172800 28 \040\001\015\315\000\003\000\000\000\000\000\000\000\000\000\011
additional: d.nic.sony 172800 28 \040\001\015\315\000\004\000\000\000\000\000\000\000\000\000\011

3. nic.sony

$ dig -t ns nic.sony @l.gmoregistry.net.

; <<>> DiG 9.11.0-P3 <<>> -t ns nic.sony @l.gmoregistry.net.
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 15757
;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 2, ADDITIONAL: 1
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;nic.sony.                      IN      NS

;; AUTHORITY SECTION:
nic.sony.               3600    IN      NS      ns1.gmointernet.com.
nic.sony.               3600    IN      NS      ns1.gmointernet.jp.

;; Query time: 7 msec
;; SERVER: 37.209.198.4#53(37.209.198.4)
;; WHEN: Sat Apr 22 06:56:25 JST 2017
;; MSG SIZE  rcvd: 102

$ dig -t ns nic.sony @l.gmoregistry.net.

; <<>> DiG 9.11.0-P3 <<>> -t ns nic.sony @l.gmoregistry.net.
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 23179
;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 2, ADDITIONAL: 1
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;nic.sony.                      IN      NS

;; AUTHORITY SECTION:
nic.sony.               3600    IN      NS      ns1.gmointernet.jp.
nic.sony.               3600    IN      NS      ns1.gmointernet.com.

;; Query time: 7 msec
;; SERVER: 37.209.198.4#53(37.209.198.4)
;; WHEN: Sat Apr 22 06:53:10 JST 2017
;; MSG SIZE  rcvd: 102

4. unbound response

これをどう思うか。

$ dig -t ns nic.sony @127.0.0.2

; <<>> DiG 9.11.0-P3 <<>> -t ns nic.sony @127.0.0.2
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 2325
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1220
;; QUESTION SECTION:
;nic.sony.                      IN      NS

;; ANSWER SECTION:
nic.sony.               85168   IN      NS      ns1.gmointernet.com.
nic.sony.               85168   IN      NS      ns1.gmointernet.jp.

;; Query time: 0 msec
;; SERVER: 127.0.0.2#53(127.0.0.2)
;; WHEN: Sat Apr 22 06:57:31 JST 2017
;; MSG SIZE  rcvd: 102