iPad Screenshots


Subnet Star is an advanced subnet calculator for the iPad in an appealing aluminum design. It's the first and only subnet calculator for the iPad!

Subnet Star is an essential tool for network configurations suitable for experienced network administrators but also for network beginners.

- Information for any address and subnet (network- & broadcast-address, subnetmask, number of usable hosts, private/public ranges and more)
- Split networks into subnets for any destination netmask
- Merge networks into supernet
- Mask range of IP addresses with exact netmasks and also with common netmask
- Easy entering of addresses and netmasks
- Netmask display in both bitcount and quad dotted notation in realtime
- E-Mail the calculation results
- Full support for English and German language
- Includes special "Sweedy sugars your day" audio-feature

It's all that easy!

What's New

Version 1.3.1

Added iOS 10 compatibility

Ratings and Reviews

Fantastic App!


This is the best app in its class, very comprehensive, very powerful and yet easy to use! Make sure to checkout the Sweedy-Feature. A must have for any network engineer or a plain network geek like me! I have been looking for an app like this forever. Well done!

Exactly what I've needed for years

Salome Jones

An excellent subnet calculator with every useful feature, including wildcards, direct RFC references, bit mask notation, etc. It's now my main network architecture tool.

I'd buy it for ten bucks if it had theme support.

Exceeds expectations


The app really exceeded my expectations!
Splitting / masking works great and I really love the Sweedy feature!
I've used many of the subnet calculators available for the iPhone but this one is doing best for me and it looks best on the iPad, too.


Andreas Fatum
35.3 MB
Requires iOS 8.0 or later. Compatible with iPad.
English, German
Age Rating
Rated 4+
© 2010-2016 Andreas Fatum


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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