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@kenji0x02
Created May 18, 2013 14:53
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FQDN(Fully Qualified Domain Name)をしらべる。 SSL証明書を作るときは、Common NameにFQDNかDomainをちゃんと書かないといけない。
$ nslookup 202.72.50.10
Server: 192.168.100.254
Address: 192.168.100.254#53
Non-authoritative answer:
10.50.72.202.in-addr.arpa name = www.rakuten.co.jp.
# www.rakuten.co.jpのところ
# look up A:【本辞書などで/コンピュータなど(の媒体)で】A〈情報など〉を調べる
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nsはname serverの略。

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