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IP Subnet Calculator

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

วิธีใช้งาน

Enter an IPv4 (e.g. 192.168.1.0) and prefix length (e.g. 24). All subnet details update instantly.

Overview

IP Subnet Calculator is a pro-dev tool that IP subnet calculator: 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

  • Test regex with highlights
  • Escape code for string literals
  • Convert between CSV/JSON/Markdown
  • Format and validate JSON
  • Use it to cross-check “子网计算、subnet calculator” in reports, docs or APIs to avoid manual conversion errors

How to use

  1. 1 Paste code/data
  2. 2 Pick action and options
  3. 3 Fix highlighted errors
  4. 4 Copy or 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

  • Watch greedy vs lazy regex
  • Strict JSON disallows comments/trailing commas
  • Disable live validation for large files

FAQ

Why invalid?
Trailing commas, single quotes or BOM often cause it.
Offline?
Yes, parsing is local.
How is IP Subnet Calculator different?
It runs locally with a focus on speed and privacy, plus tolerant parsing for “子网计算、subnet calculator” 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.
Tip：Tip: Bookmark this page or pin the tab; find related tools via categories and search (convert → calculate → export).
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All calculations run locally in your browser; nothing is uploaded.