1. watchA

必要性が見えない設定

tw.sharp なるドメイン名は存在するが、SOA RR はない、という返答だ。

2. whois

$ dig -t soa tw.sharp @ns1.sharp.co.jp

; <<>> DiG 9.18.12-0ubuntu0.22.04.1-Ubuntu <<>> -t soa tw.sharp @ns1.sharp.co.jp
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 51963
;; flags: qr aa rd; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
; COOKIE: a4185b28cfb459f41750e9256480839aa09fdbb0b170b554 (good)
;; QUESTION SECTION:
;tw.sharp.                      IN      SOA

;; AUTHORITY SECTION:
sharp.                  600     IN      SOA     ns1.sharp.co.jp. postmaster.sharp.co.jp. 2023042603 3600 1800 1209600 3600

;; Query time: 20 msec
;; SERVER: 61.214.248.154#53(ns1.sharp.co.jp) (UDP)
;; WHEN: Wed Jun 07 22:18:18 JST 2023
;; MSG SIZE  rcvd: 127

3. history

$ dig tw.sharp @ns1.sharp.co.jp

; <<>> DiG 9.11.3-1ubuntu1.12-Ubuntu <<>> tw.sharp @ns1.sharp.co.jp
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 4979
;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 3
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;tw.sharp.                      IN      A

;; ANSWER SECTION:
tw.sharp.               600     IN      A       210.203.21.240

;; AUTHORITY SECTION:
sharp.                  600     IN      NS      tg1.sharp.co.jp.
sharp.                  600     IN      NS      ns1.sharp.co.jp.

;; ADDITIONAL SECTION:
ns1.sharp.co.jp.        43200   IN      A       61.214.248.154
tg1.sharp.co.jp.        60      IN      A       61.214.248.155

;; Query time: 25 msec
;; SERVER: 61.214.248.154#53(61.214.248.154)
;; WHEN: Sat Oct 31 10:36:31 JST 2020
;; MSG SIZE  rcvd: 132

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