方法1、digコマンドを使います。 yahoo.co.jpのIPアドレスを調べることを例とします。
$ dig +short yahoo.co.jp
182.22.59.229
183.79.135.206
182.22.59.229
183.79.135.206
$ host yahoo.co.jp
yahoo.co.jp has address 183.79.135.206
yahoo.co.jp has address 182.22.59.229
yahoo.co.jp mail is handled by 10 mx2.mail.yahoo.co.jp.
yahoo.co.jp mail is handled by 10 mx5.mail.yahoo.co.jp.
yahoo.co.jp mail is handled by 10 mx3.mail.yahoo.co.jp.
yahoo.co.jp mail is handled by 10 mx1.mail.yahoo.co.jp.
yahoo.co.jp has address 183.79.135.206
yahoo.co.jp has address 182.22.59.229
yahoo.co.jp mail is handled by 10 mx2.mail.yahoo.co.jp.
yahoo.co.jp mail is handled by 10 mx5.mail.yahoo.co.jp.
yahoo.co.jp mail is handled by 10 mx3.mail.yahoo.co.jp.
yahoo.co.jp mail is handled by 10 mx1.mail.yahoo.co.jp.
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