IP / CIDR計算機
CIDR表記からネットワークアドレス・ブロードキャスト・ホスト範囲・サブネットマスクを算出。
100% client-side · no upload
How to use
- Type your network in CIDR notation, such as
10.0.0.0/8or172.16.0.0/12. - Click Calculate to compute the full subnet details.
- Copy the network address, broadcast, or host range for use in firewall rules, routing configs, or documentation.
Related network tools
- Subnet Calculator — split a network into equal-sized subnets
- DNS Record Explainer — understand A, AAAA, MX, and other record types
- Ping Output Explainer — decode RTT, TTL, and packet loss values
よくある質問
- Is this IP/CIDR calculator free?
- Yes, completely free with no signup and no usage limits.
- Does my data leave my device?
- No. All calculations run in JavaScript inside your browser. Nothing is sent to any server.
- Does it work on mobile?
- Yes. The tool is mobile-first and works on iPhone Safari and Android Chrome.
Last updated: By jarvisbox