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