nslookup IPアドレスorホスト名 [DNSサーバー]
$ nslookup yahoo.com Server: aaa.bbb.ccc.ddd Address: aaa.bbb.ddd.ddd#53 Non-authoritative answer: Name: yahoo.com Address: 206.190.36.45 Name: yahoo.com Address: 98.138.253.109 Name: yahoo.com Address: 98.139.183.24
参考： http://webkaru.net/linux/nslookup-command/
