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Calculatrice de sous-réseau IP

IP subnet calculator: calculate network address and broadcast from IPv4 and prefix for networking, with one-click copy and offline.

Mode d'emploi

Saisissez un IPv4 (ex. 192.168.1.0) et la longueur de préfixe (ex. 24) ; tous les détails se mettent à jour.

Overview

IP Subnet Calculator is a Developer tool. Calculate network address and broadcast from IPv4 and prefix for networking, with one-click copy and offline. It runs 100% in your browser with no upload, so you get instant results with privacy. Whether you need a quick answer or batch processing with precise control, you can enter, validate and export in seconds. The UI is responsive on mobile, tablet and desktop and supports one-click copy.

Use cases

  • Daily use of IP Subnet Calculator: Enter an IPv4 (e.g. 192.168.1.0) and prefix length (e.g. 24). All subnet details update instantly. — enter and get instant results without manual lookup.
  • One-click copy keeps results ready to save, check or share with family and pros.
  • Use IP Subnet Calculator offline or on poor network — all calculations stay local and private.
  • Port/DNS self-check
  • Latency assessment

How to use

  1. 1 Enter an IPv4 (e.g. 192.168.1.0) and prefix length (e.g. 24). All subnet details update instantly..
  2. 2 Choose subnet/parse/check action
  3. 3 Review tables and steps
  4. 4 Copy/export

Highlights

  • Local & private: processing stays in your browser
  • Live validation with tolerant parsing
  • One-click copy and export for docs, code or sheets
  • Batch and offline support under poor network

Notes

  • Port checks are indicative
  • Network and broadcast addresses not assignable
  • DNS cached results may differ

FAQ

Why two fewer IPs?
Network and broadcast excluded by default.
IPv6?
Supported in select tools.
How is IP Subnet Calculator different?
It runs locally with a focus on speed and privacy, plus tolerant parsing for “subnet calculator, cidr” and one-click copy for reuse.
Can I use results in official reports?
Use it as a working draft and cross-check with authoritative sources; keep the exported log and parameters for traceability.
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