PowerArubaCP

0.7.0

Private/MaskCidr.ps1


#
# Copyright 2018-2021, Alexis La Goutte <alexis.lagoutte at gmail dot com>
#
# SPDX-License-Identifier: Apache-2.0
#

function Convert-ArubaCPCIDR2Mask {

    <#
        .SYNOPSIS
        Convert a CIDR to Mask

        .DESCRIPTION
        Convert a CIDR to Mask

        .EXAMPLE
        Convert-ArubaCPCIDR2Mask 24

        Convert a CIDR (24) to Mask (255.255.255.0)

    #>
    Param(
        [Parameter (Mandatory = $true, ValueFromPipeline)]
        [int]$cidr
    )

    Process {
        switch ($cidr) {
            "0" {
                $subnet = '0.0.0.0'
            }
            "1" {
                $subnet = '128.0.0.0'
            }
            "2" {
                $subnet = '192.0.0.0'
            }
            "3" {
                $subnet = '224.0.0.0'
            }
            "4" {
                $subnet = '240.0.0.0'
            }
            "5" {
                $subnet = '248.0.0.0'
            }
            "6" {
                $subnet = '252.0.0.0'
            }
            "7" {
                $subnet = '254.0.0.0'
            }
            "8" {
                $subnet = '255.0.0.0'
            }
            "9" {
                $subnet = '255.128.0.0'
            }
            "10" {
                $subnet = '255.192.0.0'
            }
            "11" {
                $subnet = '255.224.0.0'
            }
            "12" {
                $subnet = '255.240.0.0'
            }
            "13" {
                $subnet = '255.248.0.0'
            }
            "14" {
                $subnet = '255.252.0.0'
            }
            "15" {
                $subnet = '255.254.0.0'
            }
            "16" {
                $subnet = '255.255.0.0'
            }
            "17" {
                $subnet = '255.255.128.0'
            }
            "18" {
                $subnet = '255.255.192.0'
            }
            "19" {
                $subnet = '255.255.224.0'
            }
            "20" {
                $subnet = '255.255.240.0'
            }
            "21" {
                $subnet = '255.255.248.0'
            }
            "22" {
                $subnet = '255.255.252.0'
            }
            "23" {
                $subnet = '255.255.254.0'
            }
            "24" {
                $subnet = '255.255.255.0'
            }
            "25" {
                $subnet = '255.255.255.128'
            }
            "26" {
                $subnet = '255.255.255.192'
            }
            "27" {
                $subnet = '255.255.255.224'
            }
            "28" {
                $subnet = '255.255.255.240'
            }
            "29" {
                $subnet = '255.255.255.248'
            }
            "30" {
                $subnet = '255.255.255.252'
            }
            "31" {
                $subnet = '255.255.255.254'
            }
            "32" {
                $subnet = '255.255.255.255'
            }
        }

        $subnet
    }
}