# aSubnet

> Mobile IPv4 subnet calculator with real-time network address calculations. (iPhone/iPad app by Ralf Uttenthaler.)

- Source: https://appshunter.io/ios/app/asubnet/id284941506 (this page in markdown: same URL + `.md`)
- Developer: [Ralf Uttenthaler](https://appshunter.io/developer/284941512)
- Category: Business, Productivity
- Price: $0.99
- Rating: 4.50/5 from 2 App Store ratings · 88 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.0 · 1 MB
- Languages: American English, French (France), German (Germany), European Spanish
- Released: 2019-02-01
- Data updated: 2026-07-04
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/asubnet/id284941506/reviews.md

## What is aSubnet?

FEATURES
- Simple and very fast mobile IPv4 calculation
- Displays in realtime Netmask, Number of possible Hosts, Network address and Broadcast address
- Edit your desired Host Address and recalculate
- Optional HEX Display of all network calculations
- Mail your result to archive for later needs
- Send your results per SMS/iMessage
- "Wildcard" Option
- Displays previous or next possible network
- Shake the Device to set the WLAN Address as IP Address
- Enhanced URL type handlers for submitting IP addresses and CIDR Netmaskthrough URL's from Address Book, Safari or other iPhone App's (e.g. "sub://10.200.1.1/mask;20", "subnet://10.200.1.1/mynet;16" or asubnet://10.200.1.1/;28)

## Key features

- Real-time IPv4 calculations
- Netmask, Host, Network, Broadcast display
- Editable Host Address
- Optional HEX display
- Email and SMS result sharing
- Wildcard option
- URL handlers for IP submission

## Recent user reviews (10 of 88)

All indexed reviews: https://appshunter.io/ios/app/asubnet/id284941506/reviews.md

### 5/5 — Invaluable

*2016-11-01, version 1.4.1*

I use this for double-checking my wildcard masks for access lists & making sure I didn't fat finger or flub any subnetting. Super handy for VLSM.

### 4/5 — A great simple tool!

*2016-11-01, version 1.4.1*

I find myself using this a lot for unusual CIDR situations. Any chance we'll see IPv6 support?

### 4/5 — Great ipv4 subnet calculator

*2015-06-28, version 1.4.0*

With the latest update, the app can finally be used again. Thanks for that. Would be great to add ipv6 calculator.

### 4/5 — Just in time!

*2015-06-28, version 1.4.0*

Thank you for updating the app, I was close to deleting it because of the disappearing slider bug that's been around for almost forever!

### 5/5 — It's back!  Thank you!

*2015-06-27, version 1.4.0*

Like many I used to use this tool every day but have been disappointed as it didn't work with IOS 8.3. This latest update fixes the slider bug and gives it a RetinaHD overhaul. All I can say is bless you app developers. Great job.  I have my go to tool back.

### 5/5 — Great update

*2015-06-27, version 1.4.0*

Great update that restores functionality and brings iPhone 6/6+ native resolution.

### 2/5 — Broken

*2015-05-28, version 1.3.5*

This used to be my goto subnet calculator. I gave them a chance to fix it after the iOS update broke it. Too late now. Bye.

### 1/5 — Great app

*2015-05-22, version 1.3.5*

The developer just need to spend some time to make all features, specially the slider, to work with iOS8.3

### 1/5 — Broken app

*2015-05-15, version 1.3.5*

I know my iPhone gets quirky at times but the slider bar at the bottom has disappeared. I just happened to rebuild the phone and reinstall apps but it still is missing. Not a very useful app right now

### 1/5 — Slider is broken in IOS 8.3

*2015-04-27, version 1.3.5*

I've been using this app for years and years and loved it.. Now the slider bar is broken making the app useless.  Please fix!

## Frequently asked questions about aSubnet

### What does aSubnet do?

aSubnet is a mobile application designed for fast and simple IPv4 subnet calculations. It displays essential network information such as netmask, the number of possible hosts, network address, and broadcast address in real-time as you input or edit IP addresses.

### What are the key features of aSubnet?

Key features include real-time calculation of netmask, host count, network address, and broadcast address. It also offers an optional HEX display for all calculations, the ability to mail or send results via SMS/iMessage, a "Wildcard" option, and enhanced URL handlers for submitting IP addresses and CIDR netmasks from other applications.

### Is aSubnet free to use?

Yes, based on the provided information, aSubnet is a free application. It does not have in-app purchases or advertisements, indicating a completely free user experience.

### What devices is aSubnet compatible with?

The description mentions "iPhone App's" and features like "Shake the Device to set the WLAN Address as IP Address" and "Send your results per SMS/iMessage," strongly suggesting compatibility with iOS devices. Specific iOS version requirements are not detailed.

### How can aSubnet be used in common scenarios?

This app is useful for network administrators, IT professionals, or anyone needing to quickly determine subnet details for IP addressing, network planning, or troubleshooting on a mobile device. The ability to share results via email or SMS also aids in documentation and collaboration.

## Version history (last 5 releases)

### 1.6.1 — 2023-01-06

Fixed Dark Mode Text Entry

### 1.6.0 — 2023-01-05

Code optimizations

### 1.4.1 — 2015-08-31

This app has been updated by Apple to display the Apple Watch app icon.

- fixed font issue with iOS9

### 1.4.0 — 2015-06-27

- redesigned User Interface
- iPhone 6 and iPhone 6 Plus Support
- "hidden Slider" Bug fixed occurred with iOS 8.3
- code optimization

### 1.3.5 — 2012-12-14

- iOS 6 and iPhone 5 Support added
- IP address Input enhanced
- minor Icon changes

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## More apps by Ralf Uttenthaler

- [weekSlider](https://appshunter.io/ios/app/weekslider/id364905490)
- [fritch](https://appshunter.io/ios/app/fritch/id981079618)

All apps by Ralf Uttenthaler: https://appshunter.io/developer/284941512

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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 2026-07-04.*