IPアドレスから地理的位置情報(GeoIPLocation)の検索機能を公開しました。
CIDRをIPアドレスに展開ツール v2.0.3
IPv4形式のIPアドレスは192.168.0.1などの一般的な形式だけでなく、
192.168.0.1/24 などのネットマスク指定(/24部分)による範囲指定なども利用ができます。
これはCIDR形式、プレフィックス指定などとも呼ばれています。
ここではこのネットマスク指定によるIPアドレス範囲をIPアドレスに展開して表示します。
以下に、ネットマスク形式のIPアドレスを入力すると、
下部に対して、CIDR指定に含まれるIPアドレスが表示されます。
また範囲が広く、含まれるIPアドレスが多い場合には、
結果は「xxx.xxx.xxx.xxx – xxx.xxx.xxx.xxx」形式の範囲で表示します。
範囲表示された場合は、リンクをクリックすると範囲内のIPを再展開できます。
目次
CIDR形式 (165.170.152.0/23) から範囲内のIPアドレス展開
表示値でそのまま実行するとデモ動作の確認ができます。
CIDR展開情報
入力されたCIDRのネットワーク情報です。
| 属性 | 値 |
|---|---|
| 入力IP範囲 | 165.170.152.0/23 |
| ネットワーク(CIDR) | 165.170.152.0/23 |
| サブネット表記 | 165.170.152.0/255.255.254.0 |
| 短縮表記 | 165.170.152 |
| IPアドレス範囲 | 165.170.152.0 - 165.170.153.255 |
| IPアドレス総数 | 512 |
| ネットワークIP | 165.170.152.0 |
| ブロードキャストIP | 165.170.153.255 |
| ホストアドレス範囲 | 165.170.152.1 - 165.170.153.254 有効ホスト数( 510 台 ) |
| サブネットマスク | 255.255.254.0 |
| クラス属性 | クラスＢ |
IPアドレスの展開結果
IPアドレスの展開を行いました
| No | IPアドレス範囲 |
|---|---|
| 1 | 165.170.152.0 |
| 2 | 165.170.152.1 |
| 3 | 165.170.152.2 |
| 4 | 165.170.152.3 |
| 5 | 165.170.152.4 |
| 6 | 165.170.152.5 |
| 7 | 165.170.152.6 |
| 8 | 165.170.152.7 |
| 9 | 165.170.152.8 |
| 10 | 165.170.152.9 |
| 11 | 165.170.152.10 |
| 12 | 165.170.152.11 |
| 13 | 165.170.152.12 |
| 14 | 165.170.152.13 |
| 15 | 165.170.152.14 |
| 16 | 165.170.152.15 |
| 17 | 165.170.152.16 |
| 18 | 165.170.152.17 |
| 19 | 165.170.152.18 |
| 20 | 165.170.152.19 |
| 21 | 165.170.152.20 |
| 22 | 165.170.152.21 |
| 23 | 165.170.152.22 |
| 24 | 165.170.152.23 |
| 25 | 165.170.152.24 |
| 26 | 165.170.152.25 |
| 27 | 165.170.152.26 |
| 28 | 165.170.152.27 |
| 29 | 165.170.152.28 |
| 30 | 165.170.152.29 |
| 31 | 165.170.152.30 |
| 32 | 165.170.152.31 |
| 33 | 165.170.152.32 |
| 34 | 165.170.152.33 |
| 35 | 165.170.152.34 |
| 36 | 165.170.152.35 |
| 37 | 165.170.152.36 |
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| 41 | 165.170.152.40 |
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| 257 | 165.170.153.0 |
| 258 | 165.170.153.1 |
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| 512 | 165.170.153.255 |
IPアドレスの特殊属性
入力されたIPアドレス範囲の特殊IP属性に関する情報です。
特殊属性には該当しませんでした。
| IP特殊属性 | 概要 | CIDR |
|---|---|---|
| グローバルアドレス | プライベートIPアドレス、リンクローカルアドレス、特殊用途のIPアドレスなどを除いた |
GLOBALS |
IPアドレスの特殊属性に割当てられた
各範囲・グローバルIPアドレスの範囲については、
以下リンク先でご確認下さい。
このツールの使用方法については以下でご紹介しています。
関連ツール
このツールに関連してCIDRをすべて展開するのではなく、
CIDR範囲に１つのIPアドレスが含まれているかどうかを、
チェックして確認するツールを作成公開しました。
併せてご活用いただければ幸いです。
さいごに
CIDRからIPアドレスの範囲をイメージすることは、
慣れるまでは少しとっつきにくい部分もあります。
ここでは実際に範囲を目視して、
それぞれの範囲を細かく見ていくことができるようにしています。
お役に立ちますと幸いです。
更新履歴情報
| Ver. | 更新日 | 更新内容 |
|---|---|---|
| 2.0.3 | 2018/05/10 | /32指定を行った際にエラーになる不具合を訂正。 |
| 2.0.2 | 2018/05/10 | 実行結果に表示のIP範囲再展開リンクをJavaScriptからURL形式へ変更。 Shiftを押しながらクリック等することで別画面表示を可能にし、 URLから実行結果を開けるように対応。 |
| 2.0.1 | 2018/05/09 | 実行結果に表示のCIDR再展開リンクをJavaScriptからURL形式へ変更。 Shiftを押しながらクリック等することで別画面表示を可能にし、 URLから実行結果を開けるように対応。 |
| 1.0.2 | 2015/02/21 | 特定のネットマスクの値に対しての表示結果を調整 |
| 1.0.1 | 2015/02/06 | 公開 |
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