# Subnet-Calculator — IPv4/IPv6 subnet & CIDR tool

> IPv4/IPv6 subnet & CIDR tool (iPhone/iPad app by 敬东 孙.)

- Source: https://appshunter.io/ios/app/subnet-calculator/id6782404421 (this page in markdown: same URL + `.md`)
- Developer: [敬东 孙](https://appshunter.io/developer/6782398114)
- Category: Utilities, Developer Tools
- Price: $0.99
- Age rating: 4+
- Requires: iOS 16.0 · 2 MB
- Languages: American English, Chinese (Simplified, China)
- Released: 2026-06-26
- Data updated: 2026-09-21
- User reviews in markdown: https://appshunter.io/ios/app/subnet-calculator/id6782404421/reviews.md

## What is Subnet?

Subnet Calculator is a clean, professional networking tool for network engineers, sysadmins, CCNA/CCNP students and developers. Enter an IP address and a prefix (or CIDR) and instantly get every subnet detail you need.

IPv4 CALCULATIONS
• Network and broadcast addresses
• Usable host range and host count
• Subnet mask, wildcard (inverse) mask, hex mask
• Address class (A/B/C/D/E) and category (private / public / loopback / link-local / multicast …)
• Binary view with the network and host portions colour-coded
• Convert freely between mask and CIDR prefix
• Correct handling of /31 (point-to-point) and /32 (single host)

IPv6 CALCULATIONS
• Address compression (::) and full expansion
• Address type detection (global unicast / link-local / unique local / multicast …)
• Network prefix, first and last address
• Total address count (shown as a power of two and exact value), number of /64 subnets

SUBNETTING
• Equal split: divide a network by a new prefix and list every subnet
• VLSM: allocate the right-sized subnet for each host requirement automatically

WHY YOU'LL LIKE IT
• 100% offline — no network access, no data collected, full privacy
• Tap any result to copy it
• Dark mode, universal for iPhone and iPad
• English & Chinese, follows your system language
• Clean interface, no ads

Whether you're planning a network, studying for a certification, or troubleshooting on the job, this tool gets your subnet math done fast and accurately.


## Version history (last 1 release)

### 1.0 — 2026-06-26

No release notes.

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-21.*