NetCalc Pro

Networking app for iPhone, iPad, and Mac: IPv4 and IPv6 calculators, subnetting and VLSM, Cisco IOS-style commands for routers and switches, and a checker that finds mistakes before you power on the lab. Free, no account, with iCloud sync.

dimpemekug
Published date:

What is NetCalc Pro?

NetCalc Pro works out a network’s addressing plan, generates the commands to configure routers and switches, and checks that everything adds up before you power on the lab. It’s made for people who study networking and for those who configure networks every day.

Key Features

  • IPv4 calculator: four ways to enter an address, with network, broadcast, hosts, and a color-coded binary view that separates network and host bits
  • IPv6 calculator: compression, prefixes, subnetting, and EUI-64
  • Subnetting and VLSM: equal-size blocks or sized from your host counts, with networks sorted largest first and a map of the used address space
  • Ready-made configurations: Cisco IOS-style commands for interfaces, static routes, OSPF, RIPv2, EIGRP, VLANs and 802.1Q trunks, DHCP, standard and extended ACLs, NAT/PAT, and basic hardening, with comments that explain each block
  • Import a running-config: paste it and find it in your project, device by device
  • Projects: devices and interfaces organized by lab, with search, duplication, and undo
  • Lab checker: finds overlapping subnets, duplicate or unusable addresses, unreachable next hops, networks missing from OSPF, and DHCP gateways outside the pool, with an explanation and the fix
  • Learn: a 21-chapter networking guide with worked examples, a searchable glossary, Beginner mode with more help, and Expert mode when you want less
  • Export and share: plans and projects as PDF, CSV, or text; actions for Shortcuts and Spotlight
  • iCloud sync: projects and settings kept up to date across iPhone, iPad, and Mac, with a local-only fallback if iCloud isn’t available
  • On iPhone, iPad, and Mac: free, with no ads or in-app purchases, with menus and keyboard shortcuts on the Mac; English and Italian, light or dark theme, and an accent color of your choice
  • Privacy: no account and no tracking; calculations stay on the device, and projects only go through your private iCloud

Cisco and Cisco IOS are trademarks or registered trademarks of Cisco Systems, Inc. and/or its affiliates in the U.S. and other countries. NetCalc Pro generates commands in Cisco IOS syntax; it is not developed, sponsored, or endorsed by Cisco and is not affiliated with Cisco. Other trademarks are the property of their respective owners.

Platforms

Coming to the App Store for iPhone and iPad with iOS/iPadOS 17 or later, and for Mac with macOS 14 or later: one free app for all your devices.

Privacy Policy

Updated: October 14, 2026

Data Collected
The app processes information you enter directly: the addresses and values you use in calculations, your projects with their devices and configurations, and the app's preferences. We do not collect sensitive data (health, payments, location, contacts, biometrics). No account or registration required.
Advertising & Tracking
No in-app advertising. No tracking or analytics — data is never sent to external servers for profiling.
Data Storage
All information stays on your device. Every calculation happens on your device. With iCloud sync on (the default, and it can be turned off), projects and preferences are synced across your devices through the CloudKit private database of your iCloud account — they never pass through our servers. Without iCloud, they stay on your iPhone, iPad, or Mac.
Third-Party Sharing
We do not sell or share data with third parties.
Your Rights
You can access, modify, and delete your data directly within the app.
Read the full privacy policy

Support
Contact
For questions, bug reports, or feedback: dimpemekug.app@gmail.com — We'll get back to you as soon as possible.
Reporting a Bug
Please include: device model, OS version, and steps to reproduce the issue.
All projects