hostコマンドでDNSサーバから情報を取得することができます。
オプション -v で詳細な情報を表示します。
# host -v www.google.co.jp Trying "www.google.co.jp" ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 52773 ;; flags: qr rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 7, ADDITIONAL: 0 ;; QUESTION SECTION: ;www.google.co.jp. IN A ;; ANSWER SECTION: www.google.co.jp. 55 IN A 173.194.117.184 www.google.co.jp. 55 IN A 173.194.117.191 www.google.co.jp. 55 IN A 173.194.117.175 www.google.co.jp. 55 IN A 173.194.117.183 ;; AUTHORITY SECTION: jp. 21499 IN NS d.dns.jp. jp. 21499 IN NS e.dns.jp. jp. 21499 IN NS f.dns.jp. jp. 21499 IN NS g.dns.jp. jp. 21499 IN NS a.dns.jp. jp. 21499 IN NS b.dns.jp. jp. 21499 IN NS c.dns.jp. Received 214 bytes from 127.0.0.1#53 in 4 ms Trying "www.google.co.jp" ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 58571 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;www.google.co.jp. IN AAAA Received 34 bytes from 127.0.0.1#53 in 7 ms Trying "www.google.co.jp" ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 42309 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0 ;; QUESTION SECTION: ;www.google.co.jp. IN MX ;; AUTHORITY SECTION: google.co.jp. 60 IN SOA ns3.google.com. dns-admin.google .com. 1566344 900 900 1800 60 Received 94 bytes from 127.0.0.1#53 in 50 ms
