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theSub.ps1
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theSub.ps1
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# |`-:_
# ,----....____ | `+.
# ( ````----....|___ |
# \ _ ````----....____
# \ _) ```---.._
# \ \
# )`.\ )`. )`. )`. )`. )`. )`. )`. )`. )`. )
# -' `-' `-' `-' `-' `-' `-' `-' `-' `-' `-' `
# The Sub: Expeditionary VLSM Calculator
# Documentation at: https://github.com/TheMagicNacho
# v0.0.3
# TODO:
# ------------------------------------------------
function Get-IPs {
Param(
[Parameter(Mandatory = $true)]
[array] $Subnets
)
foreach ($subnet in $subnets)
{
#Split IP and subnet
$IP = ($Subnet -split "\/")[0]
$SubnetBits = ($Subnet -split "\/")[1]
#Convert IP into binary
#Split IP into different octects and for each one, figure out the binary with leading zeros and add to the total
$Octets = $IP -split "\."
$IPInBinary = @()
foreach($Octet in $Octets)
{
#convert to binary
$OctetInBinary = [convert]::ToString($Octet,2)
#get length of binary string add leading zeros to make octet
$OctetInBinary = ("0" * (8 - ($OctetInBinary).Length) + $OctetInBinary)
$IPInBinary = $IPInBinary + $OctetInBinary
}
$IPInBinary = $IPInBinary -join ""
#Get network ID by subtracting subnet mask
$HostBits = 32-$SubnetBits
$NetworkIDInBinary = $IPInBinary.Substring(0,$SubnetBits)
#Get host ID and get the first host ID by converting all 1s into 0s
$HostIDInBinary = $IPInBinary.Substring($SubnetBits,$HostBits)
$HostIDInBinary = $HostIDInBinary -replace "1","0"
#Work out all the host IDs in that subnet by cycling through $i from 1 up to max $HostIDInBinary (i.e. 1s stringed up to $HostBits)
#Work out max $HostIDInBinary
$imax = [convert]::ToInt32(("1" * $HostBits),2) -1
$IPs = @()
#Next ID is first network ID converted to decimal plus $i then converted to binary
For ($i = 1 ; $i -le $imax ; $i++)
{
#Convert to decimal and add $i
$NextHostIDInDecimal = ([convert]::ToInt32($HostIDInBinary,2) + $i)
#Convert back to binary
$NextHostIDInBinary = [convert]::ToString($NextHostIDInDecimal,2)
#Add leading zeros
#Number of zeros to add
$NoOfZerosToAdd = $HostIDInBinary.Length - $NextHostIDInBinary.Length
$NextHostIDInBinary = ("0" * $NoOfZerosToAdd) + $NextHostIDInBinary
#Work out next IP
#Add networkID to hostID
$NextIPInBinary = $NetworkIDInBinary + $NextHostIDInBinary
#Split into octets and separate by . then join
$IP = @()
For ($x = 1 ; $x -le 4 ; $x++)
{
#Work out start character position
$StartCharNumber = ($x-1)*8
#Get octet in binary
$IPOctetInBinary = $NextIPInBinary.Substring($StartCharNumber,8)
#Convert octet into decimal
$IPOctetInDecimal = [convert]::ToInt32($IPOctetInBinary,2)
#Add octet to IP
$IP += $IPOctetInDecimal
}
#Separate by .
$IP = $IP -join "."
$IPs += $IP
}
$IPs
}
}
Get-IPs -Subnets '192.168.0.0/24'