# Subnet Calculator - IP Tool — CIDR calculator for engineers.

> CIDR calculator for engineers. (iPhone/iPad app by Shota Yamada.)

- Source: https://appshunter.io/ios/app/subnet-calculator-ip-tool/id6792478518 (this page in markdown: same URL + `.md`)
- Developer: [Shota Yamada](https://appshunter.io/developer/6779611526)
- Category: Utilities, Productivity
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.6 · 4 MB
- Languages: American English, Japanese
- Released: 2026-08-15
- Data updated: 2026-09-01
- User reviews in markdown: https://appshunter.io/ios/app/subnet-calculator-ip-tool/id6792478518/reviews.md

## What is Subnet Calculator?

"Subnet Calculator" is a simple yet powerful IP address calculation tool designed for network engineers, IT professionals, and students.

Simply enter an IP address and select the CIDR (prefix length) to instantly calculate essential network information:

Network Address

Broadcast Address

Usable IP Range

Number of Available Hosts

[Key Features]

Intuitive Interface: Fast decimal pad input and easy CIDR selection to speed up your workflow.

Strict Input Validation: Prevents configuration errors by blocking invalid formats like leading zeros (e.g., 010) that can be misread by routers as octal numbers.

One-Tap Copy: Copy the entire calculation result to your clipboard with a single tap, making it easy to paste into terminal sessions or documentation.

Cheat Sheet: Includes a quick reference list of subnet masks and host counts from /8 to /32.

Built to improve efficiency in network design, deployment, and troubleshooting. A must-have utility tool for your daily IT operations.

[Disclaimer]
While every effort has been made to ensure the accuracy of the calculation results, the developer makes no guarantees regarding its suitability for all environments. The developer shall not be held liable for any network issues, damages, or losses resulting from the use of this application. Please verify all configurations at your own risk before deploying them to actual network equipment.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Remove Ads | $2.99 | one-time |
| Buy Me a Coffee☕️ | $1.99 | one-time |



## Version history (last 3 releases)

### 1.0.2 — 2026-08-25

Minor bug fixes and improvements.

### 1.0.1 — 2026-08-22

Minor bug fixes and improvements.

### 1.0 — 2026-08-15

No release notes.

## More apps by Shota Yamada

- [PowerTimer - Interval Timer](https://appshunter.io/ios/app/powertimer-interval-timer/id6779611524)
- [BinDecHex Converter](https://appshunter.io/ios/app/bindechex-converter/id6790080993)
- [RatioCalculator - Simple UI](https://appshunter.io/ios/app/ratiocalculator-simple-ui/id6799084695)
- [SOKOKAKU - Unit Price Compare](https://appshunter.io/ios/app/sokokaku-unit-price-compare/id6800284797)
- [WattCalc - Microwave](https://appshunter.io/ios/app/wattcalc-microwave/id6801974232)

All apps by Shota Yamada: https://appshunter.io/developer/6779611526

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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 2026-09-01.*