# CIDR Calc — Subnet and host calculator

> Network subnet calculator for IP addresses and CIDR notation. (iPhone/iPad app by Paul Smicker.)

- Source: https://appshunter.io/ios/app/cidr-calc/id1565667811 (this page in markdown: same URL + `.md`)
- Developer: [Paul Smicker](https://appshunter.io/developer/1565667813)
- Category: Utilities
- Price: Free
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 16.0 · 1 MB
- Languages: American English
- Released: 2021-05-04
- Data updated: 2026-07-05
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/cidr-calc/id1565667811/reviews.md

## What is CIDR Calc?

Displays subnet, IP addresses, mask, and reverse mask based on IP and CIDR notation. Generates shareable list of all subnets and hosts in next higher octet.

## Key features

- Subnet calculation
- IP address display
- Mask and reverse mask
- Shareable subnet lists
- Host calculation


## Frequently asked questions about CIDR Calc

### What is CIDR Calc used for?

CIDR Calc is used to display subnet details, IP addresses, masks, and reverse masks based on IP and CIDR notation. It also generates shareable lists of all subnets and hosts in the next higher octet.

### Is CIDR Calc free to use?

Yes, CIDR Calc is available for free.

### What devices does CIDR Calc support?

CIDR Calc is supported on iPhone, iPad, and realityDevice.

### How often is CIDR Calc updated?

The latest version, 1.5.1, was released on 2025-12-12, indicating regular updates from the developer.

### What is the age rating for CIDR Calc?

CIDR Calc has an age rating of 4+, making it suitable for a wide range of users.

### Does CIDR Calc have ads?

No, CIDR Calc does not contain advertisements.

### What is the user rating for CIDR Calc?

CIDR Calc has an excellent rating of 5.0 stars based on 1 review.

### Can I share subnet information from CIDR Calc?

Yes, CIDR Calc allows you to generate and share lists of all subnets and hosts within the next higher octet.

## Version history (last 4 releases)

### 1.5.1 — 2025-12-12

Bug fixes, new dark mode icon

### 1.5 — 2024-02-08

Minor bug fixes
Version parity with CIDR Calc for Apple Vision Pro

### 1.0.1 — 2022-11-21

•Recompiled for iOS 16
•Fixed small bug in randomizer function
•Added haptic feedback for buttons on supported devices

### 1.0 — 2021-05-04

No release notes.

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## More apps by Paul Smicker

- [Dig Girl](https://appshunter.io/ios/app/dig-girl/id6449253324)

All apps by Paul Smicker: https://appshunter.io/developer/1565667813

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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 2026-07-05.*