アドレス (URL)とドメインの違い | 世界の宗教とスピリチュアル

アドレス (URL)とドメインの違い

皆さんはインターネットアドレスとドメインの違いを正しく説明できますか。

今回はあやふやになっているアドレスとドメインの違いを説明していきたいと思います。

 

まずはざっくり

1、アドレス=URLと考えて良い。

2、ドメイン=IPアドレス。

3、アドレスおよびドメインは文字化したもの

 

ドメイン

ドメインは、IPアドレスに紐づけられています。

なので指定のページに行きたい際は、本来はIPアドレスで事足りる様です。

 

インターネットアドレス

アドレスは俗語と考えて、本来はURL(Uniform Resource Locator)が正式名称であることを頭に入れておかなければいけません。

Uniform Resource Locatorは、日本語で統一資源位置指定子という様ですが、インターネット上のリソースを特定するための形式的な記号の並び、のことの様です。

参考:https://ja.wikipedia.org/wiki/Uniform_Resource_Locator

URLはあくまで英語となり、馴染みのない言葉となるため、インターネット上の住所(=アドレス)という言葉が一般的に普及したと思われます。

 

補足

アドレス (URL)とドメインの違い

上記のことから、ブラウザの検索画面にURLを入れてみたんです。

https://15x.11x.14x.x/(本来xは数字)

そうしたら、ファイルがないことを示す404エラーが出てしました。

調べてみると、複数のドメインが1つのIPアドレスに紐づく場合、特定のサイトを指定できないことがあるそうです。

参考:http://www.geolocation.co.jp/learn/dns/28.html

むむむ、なるほど。

私はサーバーに3つドメインを登録していますので、上記に当てはまる様です。

 

まとめ

ドメインは英字しか指定できないため、ドメインではなくIPアドレスでもさほど問題ない様な気がします。

また英字でも結局自分の取得したいドメインは取れない場合も多いため、正直ドメインはあまり意味のないものの様な気がします。

こっちも読んで!
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