digコマンドでネームサーバを調べる
ドメインのネームサーバを何処に設定したかdigコマンドで調べる場合は「ns」のオプションを使用します。NSのオプションを使用するとドメイン名に対応するNSレコードを取得する事ができます
$ dig onamae.com ns ; <<>> DiG 9.9.4-RedHat-9.9.4-51.el7_4.2 <<>> onamae.com ns ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 35182 ;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 4 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 4096 ;; QUESTION SECTION: ;onamae.com. IN NS ;; ANSWER SECTION: onamae.com. 1893 IN NS ns1.gmointernet.com. onamae.com. 1893 IN NS ns1.gmointernet.jp. ;; ADDITIONAL SECTION: ns1.gmointernet.com. 1685 IN A 157.7.32.254 ns1.gmointernet.com. 1685 IN AAAA 2400:8500:3000::254 ns1.gmointernet.jp. 1893 IN A 157.7.33.254 ;; Query time: 0 msec ;; SERVER: 210.134.55.219#53(210.134.55.219) ;; WHEN: 水 5月 02 10:58:38 JST 2018 ;; MSG SIZE rcvd: 161 [ex-adm@v9747 ~]$ dig amazon.com ns ; <<>> DiG 9.9.4-RedHat-9.9.4-51.el7_4.2 <<>> amazon.com ns ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 36246 ;; flags: qr rd ra; QUERY: 1, ANSWER: 6, AUTHORITY: 0, ADDITIONAL: 9 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 4096 ;; QUESTION SECTION: ;amazon.com. IN NS ;; ANSWER SECTION: amazon.com. 336 IN NS pdns6.ultradns.co.uk. amazon.com. 336 IN NS ns3.p31.dynect.net. amazon.com. 336 IN NS pdns1.ultradns.net. amazon.com. 336 IN NS ns4.p31.dynect.net. amazon.com. 336 IN NS ns2.p31.dynect.net. amazon.com. 336 IN NS ns1.p31.dynect.net. ;; ADDITIONAL SECTION: ns3.p31.dynect.net. 3189 IN A 208.78.71.31 ns4.p31.dynect.net. 972 IN A 204.13.251.31 ns1.p31.dynect.net. 2572 IN A 208.78.70.31 pdns6.ultradns.co.uk. 2378 IN A 204.74.115.1 pdns6.ultradns.co.uk. 2378 IN AAAA 2610:a1:1017::1 pdns1.ultradns.net. 830 IN A 204.74.108.1 pdns1.ultradns.net. 830 IN AAAA 2001:502:f3ff::1 ns2.p31.dynect.net. 972 IN A 204.13.250.31 ;; Query time: 0 msec ;; SERVER: 210.134.55.219#53(210.134.55.219) ;; WHEN: 水 5月 02 10:59:29 JST 2018 ;; MSG SIZE rcvd: 340