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@bjornhouben
bjornhouben committed May 27, 2018
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205 changes: 205 additions & 0 deletions Network/Convert-IPCIDRNotationtoIPSubnetMaskNotation.ps1
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Function Convert-IPCIDRNotationtoIPSubnetMaskNotation
{
<#
.Synopsis
Convert IP CIDR notation (192.168.2.1/24) to the correct IP Subnet Mask notation (192.168.2.1 255.255.255.0)
.DESCRIPTION
Convert IP CIDR notation (192.168.2.1/24) to the correct IP Subnet Mask notation (192.168.2.1 255.255.255.0)
.PARAMETER IPCIDR
Enter the IPCIDR as follows: 192.168.2.1/24
.EXAMPLE
Convert-IPCIDRNotationtoIPSubnetMaskNotation -IPCIDR '192.168.1.2/24' | Format-Table
Description
-----------
Convert a single IP address with the IP CIDR notation to the IP SubnetMask notation and show all output.
.EXAMPLE
Convert-IPCIDRNotationtoIPSubnetMaskNotation -IPCIDR '192.168.1.2/24' | Select-Object IPandSubnetMask
Description
-----------
Convert a single IP address with the IP CIDR notation to the IP SubnetMask notation and select only the IPandSubnetMask
.EXAMPLE
Convert-IPCIDRNotationtoIPSubnetMaskNotation -IPCIDR '192.168.1.2/24' -verbose
Description
-----------
Convert a single IP address with the IP CIDR notation to the IP SubnetMask notation and show verbose output
.EXAMPLE
Convert-IPCIDRNotationtoIPSubnetMaskNotation -IPCIDR '192.168.1.2/24' -whatif
Description
-----------
Simulate converting a single IP address with the IP CIDR notation to the IP SubnetMask notation without actually doing it.
.EXAMPLE
$SourceFile = 'C:\Temp\IPCIDRAddresses.txt'
$TargetFile = 'C:\Temp\IPSubnetMaskAddresses.txt'
$IPCIDRAddresses = Get-Content -path $SourceFile
$IPCIDRAddresses | Convert-IPCIDRNotationtoIPSubnetMaskNotation | Select-Object IPandSubnetMask -ExpandProperty IPandSubnetMask | Out-File -FilePath $TargetFile -Force -append
Invoke-Expression $TargetFile
Description
-----------
Get IP addresses with the IP CIDR notation from a .txt file
Convert it to the IP SubnetMask notation
Select only the IPandSubnetMask
Output the results to the output file
Open the output file
.EXAMPLE
$SourceFile = 'C:\Temp\IPCIDRAddresses.txt'
$IPCIDRAddresses = Get-Content -path $SourceFile
$IPCIDRAddresses | Convert-IPCIDRNotationtoIPSubnetMaskNotation | Out-Gridview
Description
-----------
Get IP addresses with the IP CIDR notation from a .txt file
Convert it to the IP SubnetMask notation
Show the results in Out-Gridview
.EXAMPLE
$SourceFile = 'C:\Temp\IPCIDRAddresses.txt'
$IPCIDRAddresses = Get-Content -path $SourceFile
$IPCIDRAddresses | Convert-IPCIDRNotationtoIPSubnetMaskNotation | Format-Table
Description
-----------
Get IP addresses with the IP CIDR notation from a .txt file
Convert it to the IP SubnetMask notation
Show the results using Format-Table
.EXAMPLE
$SourceFile = 'C:\Temp\IPCIDRAddresses.txt'
$TargetFile = 'C:\Temp\IPSubnetMaskAddresses.csv'
$IPCIDRAddresses = Get-Content -path $SourceFile
$IPCIDRAddresses | Convert-IPCIDRNotationtoIPSubnetMaskNotation | ConvertTo-Csv -NoTypeInformation | Out-File -FilePath $TargetFile -Force -append
Invoke-Expression $TargetFile
Description
-----------
Get IP addresses with the IP CIDR notation from a .txt file
Convert it to the IP SubnetMask notation
Output the results to the output file as csv
Open the output file
.EXAMPLE
'192.168.2.1/24','172.16.1.1/16' | Convert-IPCIDRNotationtoIPSubnetMaskNotation | Format-Table
Invoke-Expression $TargetFile
Description
-----------
Manually enter two IP addresses in the IP CIDR notation, convert them to the IP SubnetMask notation and output the result using Format-Table.
.EXAMPLE
Convert-IPCIDRNotationtoIPSubnetMaskNotation -IPCIDR '192.168.2.1/24','172.16.1.1/16' | Format-Table
Invoke-Expression $TargetFile
Description
-----------
Manually enter two IP addresses in the IP CIDR notation, convert them to the IP SubnetMask notation and output the result using Format-Table.
.NOTES
there are no checks yet to verify if the IP address is possible and if the CIDR subnet mask are possible.
#>
[CmdletBinding(SupportsShouldProcess=$true)] #Provides advanced functionality. For more details see "What does PowerShell's [CmdletBinding()] Do?" : http://www.windowsitpro.com/blog/powershell-with-a-purpose-blog-36/windows-powershell/powershells-[cmdletbinding]-142114
Param
(
#Defines the $XADataCollector parameter
[Parameter(Mandatory=$true, #Parameter is mandatory.
ValueFromPipeline=$True, #Allows pipeline input.
Position=0, #Allows function to be called without explicitly specifying parameters, but instead using positional parameters in the correct order
HelpMessage='Enter the Enter the IPCIDR as follows: "192.168.2.1/24"')] #Enter a help message to be shown when no parameter value is provided.
[ValidateNotNullOrEmpty()] #Validate the input is not NULL or empty
[String[]]$IPCIDR #IPCIDR parameter is of the String array type and can contain multiple string.
)

BEGIN
{
$Output = @() #Create empty relay to contain results
}
PROCESS
{
Foreach($entry in $IPCIDR) #Foreach is to handle pipeline input and multiple inputs
{
IF($entry -eq $NULL)
{
}
ELSE
{
if ($pscmdlet.ShouldProcess("$entry", "Convert IPCIDR notation to IP SubnetMask notation"))
{
Write-Verbose -Message "Try splitting the IP and CIDR from the IPCIDR input for $entry"
$IP = $entry.split('/')[0]
$CIDR = $entry.split('/')[1]

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

$result = [pscustomobject][ordered]@{ #construct the $result object
IPCIDR = $entry
IPAddress = $IP
CIDR = "/$CIDR"
SubnetMask = $SubnetMask
IPandSubnetMask = "$IP $SubnetMask"
}
Write-Verbose -Message "Converted $entry to $($Result.IPandSubnetMask)"

$Output += $Result #Add the result to the $output object
}
}
}
}
END
{
$Output #Output result to pipeline
}
}

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