# Subnetwork — IPv4 subnets with FLSM, VLSM

> IPv4 subnet calculator for FLSM and VLSM with detailed binary and saved configurations. (iPhone/iPad app by Nicholas Smart.)

- Source: https://appshunter.io/ios/app/subnetwork/id1523667659 (this page in markdown: same URL + `.md`)
- Developer: [Nicholas Smart](https://appshunter.io/developer/1523667661)
- Category: Utilities, Developer Tools
- Price: Free
- Rating: 4.40/5 from 7 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 13.0 · 1 MB
- Languages: American English
- Released: 2020-07-18
- Data updated: 2026-09-04
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/subnetwork/id1523667659/reviews.md

## What is Subnetwork?

Subnetwork is a full-feature IPv4 subnet calculator that allows you to effortlessly calculate single subnets, Fixed Length Subnet Masks (FLSM) and Variable Length Subnet Masks (VLSM) using whatever IPv4 address and Classless Inter-Domain Routing (CIDR) notation you choose.  

Subnetting may be complicated and tedious, but that doesn't mean your user experience needs to be.  Designed exclusively for iOS, Subnetwork is a native and intuitive networking tool for students and IT professionals alike. 

Subnet Calculator - Calculate the subnet mask, wildcard, network ID, host range, broadcast addresses and more with an IPv4 address and dynamically adjustable CIDR prefix.

Fixed Length Subnet Mask (FLSM) Calculator - Instantly generate between 2 and 1028 FLSM subnets to meet your network and host requirements. 

Variable Length Subnet Mask (VLSM) Calculator - Instantly generate VLSM subnets to meet your custom host requirements and maximize your available address space. 

Simple and Powerful  - View minimal subnet details in decimal notation, or rotate your device for full binary calculations across all modes. View basic information at a glance in FLSM or VLSM, or dive into the details with just one touch. The choice is yours.

Save Support - Name, store, and retrieve your subnets for later use across all three calculator modes.

## Key features

- IPv4 subnet calculation
- FLSM subnet generation
- VLSM subnet generation
- Detailed binary calculations
- Save and retrieve subnet configurations
- Intuitive user interface

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/subnetwork/id1523667659/reviews.md

### 1/5 — /29

*2024-02-06*

Provides incorrect answer for the amount of networks in a /29

## Frequently asked questions about Subnetwork

### What is Subnetwork used for?

Subnetwork is a full-feature IPv4 subnet calculator. It helps users calculate single subnets, Fixed Length Subnet Masks (FLSM), and Variable Length Subnet Masks (VLSM) using IPv4 addresses and CIDR notation.

### Is Subnetwork free to use?

Yes, Subnetwork is available for free. It does not have any in-app purchases or advertisements, offering a completely free user experience.

### What devices does Subnetwork support?

Subnetwork is designed exclusively for iOS devices. It is supported on iPhone and iPod.

### How often is Subnetwork updated?

The latest version of Subnetwork is 1.1, which was last updated on April 4, 2021. This indicates a moderate update frequency for the application.

### Can I save my subnet calculations with Subnetwork?

Yes, Subnetwork allows you to name, store, and retrieve your subnets for later use. This feature is available across all three calculator modes: single subnet, FLSM, and VLSM.

### What is the age rating for Subnetwork?

Subnetwork has an age rating of 4+. This means it is suitable for users of all ages, with no content restrictions.

### Does Subnetwork offer binary calculations?

Yes, Subnetwork provides full binary calculations. You can view minimal subnet details in decimal notation or rotate your device for detailed binary calculations across all modes.

### What is the user sentiment for Subnetwork based on ratings?

Subnetwork has a strong user rating of 4.4 stars from 7 ratings, indicating that users generally find the app to be effective and useful for their networking needs.

## Version history (last 4 releases)

### 1.1 — 2021-04-04

- Minor UI and UX updates. 
- FLSM and VLSM calculation optimizations.

### 1.0.2 — 2021-03-20

- Fixed an issue where adding a network requirement in VLSM could cause a crash.

### 1.0.1 — 2020-10-11

- Various bug fixes and improvements.

### 1.0 — 2020-07-18

No release notes.

## Apps similar to Subnetwork

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Subnet Plus: Subnet Calculator](https://appshunter.io/ios/app/subnet-plus-subnet-calculator/id724663668) | 4.7 (55) | Free | Utilities |
| [Subnet Calculator +](https://appshunter.io/ios/app/subnet-calculator-plus/id445990645) | 4.0 (7) | Free | Utilities |
| [CIDR Calc](https://appshunter.io/ios/app/cidr-calc/id1565667811) | 5.0 (1) | Free | Utilities |
| [IPv4 Subnet Calculator](https://appshunter.io/ios/app/ipv4-subnet-calculator/id6446788822) | 5.0 (3) | Free | Utilities |
| [IPCalc - Calculate The Network](https://appshunter.io/ios/app/ipcalc-calculate-the-network/id1577092870) | 5.0 (1) | Free | Utilities |
| [CIDR](https://appshunter.io/ios/app/cidr/id1564239813) | 5.0 (1) | Free | Utilities |

## More apps by Nicholas Smart

- [Infinity Bottle](https://appshunter.io/ios/app/infinity-bottle/id1530030278)
- [upliNK Rowing](https://appshunter.io/ios/app/uplink-rowing/id6781021065)

All apps by Nicholas Smart: https://appshunter.io/developer/1523667661

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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 2026-09-04.*