サブネット & CIDR 計算

ホスト境界、使用可能範囲、マスク、ネットワークIDを計算します。

Computational Status

ツールの出力を自動的に分析し、結果を平易な日本語で説明します。

パラメータの設定

IPv4 Address

CIDR Mask Prefix

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Learn more about how this tool works and standard configurations

CIDR (Classless Inter-Domain Routing) notation like /24 describes network size. /24 = 256 addresses.

A /24 subnet has 256 total addresses — 254 usable hosts (subtract network and broadcast).

Currently the calculator focuses on IPv4 subnet math. IPv6 support is coming soon.