1. jp.sharp ゾーンを探す

1.1. sharp TLD

$dig -t ns sharp @a.root-servers.net

;; AUTHORITY SECTION:
sharp.                  172800  IN      NS      l.gmoregistry.net.
sharp.                  172800  IN      NS      a.gmoregistry.net.
sharp.                  172800  IN      NS      b.gmoregistry.net.
sharp.                  172800  IN      NS      k.gmoregistry.net.

$dig -t ns jp.sharp @a.gmoregistry.net

;; AUTHORITY SECTION:
jp.sharp.               86400   IN      NS      ns1.sharp.co.jp.
jp.sharp.               86400   IN      NS      tg1.sharp.co.jp.

1.2. NS query

ところが、こんな返事が返る。

$ dig -t ns jp.sharp @ns1.sharp.co.jp

; <<>> DiG 9.11.3-1ubuntu1.14-Ubuntu <<>> -t ns jp.sharp @ns1.sharp.co.jp
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 10483
;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
; COOKIE: cc5857609cf751b06079be746105e9ec75770ab967235a9e (good)
;; QUESTION SECTION:
;jp.sharp.                      IN      NS

;; ANSWER SECTION:
jp.sharp.               300     IN      CNAME   ualsharp.hs.llnwd.net.

;; Query time: 27 msec
;; SERVER: 61.214.248.154#53(61.214.248.154)
;; WHEN: Sun Aug 01 09:25:16 JST 2021
;; MSG SIZE  rcvd: 100

1.3. jp.sharp ゾーンはない

CNAME レコードはなにか。

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