Subnet / CIDR Calculator
Calculate IP subnet mask, network address, broadcast address, IP range, wildcard mask, and usable host count from IP and CIDR prefix.
Fonctionnalités Clés et Garantie de Confidentialité
- ✓ Exécution 100% Navigateur : Vos données ne quittent jamais votre appareil ni ne touchent un serveur distant.
- ✓ Résultat Instantané en Temps Réel : Aucune latence réseau, calcul immédiat et copie rapide.
- ✓ Gratuit et Illimité pour Toujours : Pas d'inscription, pas de paywall ni de quota quotidien.
- ✓ Conforme aux Standards : Conçu rigoureusement selon les spécifications RFC, ISO et W3C.
IP Subnet Mask & Network Range Calculator
Calculate IPv4 network boundaries, wildcard masks, and total usable hosts instantly. Works offline in your browser for DevOps, sysadmins, and network engineers.
Spécifications Techniques et Architecture
- Execution Environment:
- 100% Client-Side Browser Sandbox
- Data Privacy:
- Zero Server Storage / No Tracking
- Processing Speed:
- Real-time local CPU execution
- Cross-Platform:
- Works on Windows, macOS, Linux, iOS & Android
Local Processing for Network Tools
This tool runs within your browser sandbox using modern Web APIs. Inputs are processed on your local device CPU, avoiding network latency and ensuring your data is never stored on external servers or accessible to third parties.
Provide Input
Enter, paste, or upload your data into the input field above.
Configure & Process
The tool immediately processes your input in real time according to your chosen settings.
Copy or Save
Use the Copy button to copy the output to your clipboard, or download the result to your device.
Cas d'Utilisation Fréquents
- Design VPC and subnet ranges in AWS, Google Cloud, or Azure
- Calculate usable IP addresses for DHCP pools and router configuration
- Verify wildcard masks for Cisco ACLs and firewall rules
- Convert CIDR notation (/27, /28) to dotted decimal subnet masks (255.255.255.224)
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Foire aux questions
- What is a CIDR notation?
- CIDR (Classless Inter-Domain Routing) notation specifies an IP address and its associated network prefix length (e.g. /24). The prefix number indicates how many leading bits are used for the network ID.
- How many usable hosts in a /24 subnet?
- A /24 subnet provides 256 total IP addresses, of which 254 are usable for hosts (excluding the network address .0 and broadcast address .255).
- What is the difference between Subnet Mask and Wildcard Mask?
- A Subnet Mask uses 1s for the network portion (e.g. 255.255.255.0). A Wildcard Mask is the bitwise inverse (e.g. 0.0.0.255), commonly used in Cisco ACLs and OSPF routing.
- Is my IP data sent to any server?
- No — all subnet calculations are performed entirely in your browser using local JavaScript.