Download of SubnetCalc 2.6 for Mac was on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. Subnetcalc-1.1.dmg is the common file name to indicate the SubnetCalc installer.
This app's bundle is identified as com.swipestack.SubnetCalc. You can execute SubnetCalc on Mac OS X 10.6 or later. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe. The actual developer of this free software for Mac is Julien Mulot. The program belongs to Internet & Network Tools. The most popular versions of the program are 1.2 and 1.1.
From the developer:
SubnectCalc is a tool to help you to make the network IP addressing on MacOS X.
You may want to check out more Mac applications, such as SSH Tunnel Manager, IPSecuritas or Net Monitor, which might be similar to SubnetCalc.