1. watch-www/cta.co.jp

ここもwwwがゾーンになっているが、親ゾーンがない。

$ dnsq a www.cta.co.jp a.dns.jp
1 www.cta.co.jp:
77 bytes, 1+0+2+0 records, response, noerror
query: 1 www.cta.co.jp
authority: cta.co.jp 86400 NS ns4.sphere.ad.jp
authority: cta.co.jp 86400 NS ns3.sphere.ad.jp

tmaeno@:~$ dnsq a cta.co.jp a.dns.jp
1 cta.co.jp:
73 bytes, 1+0+2+0 records, response, noerror
query: 1 cta.co.jp
authority: cta.co.jp 86400 NS ns4.sphere.ad.jp
authority: cta.co.jp 86400 NS ns3.sphere.ad.jp

2. sphere.ad.jp

tmaeno@:~$ dnsq a www.cta.co.jp ns3.sphere.ad.jp
1 www.cta.co.jp:
109 bytes, 1+1+2+1 records, response, authoritative, noerror
query: 1 www.cta.co.jp
answer: www.cta.co.jp 86400 A 119.245.184.123
authority: www.cta.co.jp 86400 NS ns4.sphere.ad.jp
authority: www.cta.co.jp 86400 NS ns3.sphere.ad.jp
additional: ns3.sphere.ad.jp 86400 A 202.239.113.22

$ dig -t ns cta.co.jp @ns4.sphere.ad.jp.

; <<>> DiG 9.12.0 <<>> -t ns cta.co.jp @ns4.sphere.ad.jp.
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: REFUSED, id: 9020
;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;cta.co.jp.                     IN      NS

;; Query time: 5 msec
;; SERVER: 202.239.113.30#53(202.239.113.30)
;; WHEN: Thu Mar 01 00:25:01 JST 2018
;; MSG SIZE  rcvd: 38