https://powershell.org/tags/cidr/Recent content in Cidr on PowerShell.org - Welcome Automaters!Hugoen-usMon, 21 Sep 2026 00:00:00 +0000https://powershell.org/articles/2026/09/find-free-azure-cidr-blocks-with-powershell/Mon, 21 Sep 2026 00:00:00 +0000https://powershell.org/articles/2026/09/find-free-azure-cidr-blocks-with-powershell/<p>Suppose the network team assigns <code>10.172.0.0/16</code> to an Azure landing zone. You need to divide it into correctly aligned virtual network and subnet ranges, then find space for future networks without overlapping anything already deployed.</p> <p>This article uses PowerShell to perform both tasks: break a parent range into planned CIDR blocks and find free blocks around an existing allocation.</p> <h2 id="a-small-module-for-cidr-calculations" class="ps-heading">A small module for CIDR calculations<a class="ps-heading-anchor" href="#a-small-module-for-cidr-calculations" aria-label="Link to this section" title="Link to this section"><i class="fas fa-link" aria-hidden="true"></i></a> </h2> <p><a href="https://www.powershellgallery.com/packages/ipmgmt/0.1.18">ipmgmt</a> is a small open-source PowerShell module I maintain. It contains two commands:</p>