Get-IPNetwork.psm1
|
function Get-IPNetwork { [CmdletBinding()] Param( [Parameter(Mandatory, Position=0)] [ValidateScript({$_ -eq ([IPAddress]$_).IPAddressToString})] [string]$IPAddress, [Parameter(Mandatory, Position=1, ParameterSetName="SubnetMask")] [ValidateScript({$_ -eq ([IPAddress]$_).IPAddressToString})] [ValidateScript({ $SMReversed = [IPAddress]$_ $SMReversed = $SMReversed.GetAddressBytes() [array]::Reverse($SMReversed) [IPAddress]$SMReversed = $SMReversed [convert]::ToString($SMReversed.Address,2) -match "^[1]*0{0,}$" })] [string]$SubnetMask, [Parameter(Mandatory, Position=1, ParameterSetName="CIDRNotation")] [ValidateRange(0,32)] [int]$PrefixLength, [switch]$ReturnAllIPs ) [IPAddress]$IPAddress = $IPAddress if ($SubnetMask) { [IPAddress]$SubnetMask = $SubnetMask $SMReversed = $SubnetMask.GetAddressBytes() [array]::Reverse($SMReversed) [IPAddress]$SMReversed = $SMReversed [int]$PrefixLength = [convert]::ToString($SMReversed.Address,2).replace(0,'').length } else { [IPAddress]$SubnetMask = ([Math]::Pow(2,$PrefixLength) -1) * [Math]::Pow(2, (32 - $PrefixLength)) } $FullMask = [UInt32]'0xffffffff' $WildcardMask = [IPAddress]($SubnetMask.Address -bxor $FullMask) $NetworkId = [IPAddress]($IPAddress.Address -band $SubnetMask.Address) $Broadcast = [IPAddress](($FullMask - $NetworkId.Address) -bxor $SubnetMask.Address) # Used for determining first usable IP Address $FirstIPByteArray = $NetworkId.GetAddressBytes() [Array]::Reverse($FirstIPByteArray) # Used for determining last usable IP Address $LastIPByteArray = $Broadcast.GetAddressBytes() [Array]::Reverse($LastIPByteArray) # Handler for /31, /30 CIDR prefix values, and default for all others. switch ($PrefixLength) { 31 { $TotalIPs = 2 $UsableIPs = 2 $FirstIP = $NetworkId $LastIP = $Broadcast $FirstIPInt = ([IPAddress]$FirstIPByteArray).Address $LastIPInt = ([IPAddress]$LastIPByteArray).Address break; } 32 { $TotalIPs = 1 $UsableIPs = 1 $FirstIP = $IPAddress $LastIP = $IPAddress $FirstIPInt = ([IPAddress]$FirstIPByteArray).Address $LastIPInt = ([IPAddress]$LastIPByteArray).Address break; } default { # Usable Address Space $TotalIPs = [Math]::pow(2,(32 - $PrefixLength)) $UsableIPs = $TotalIPs - 2 # First usable IP $FirstIPInt = ([IPAddress]$FirstIPByteArray).Address + 1 $FirstIP = [IPAddress]$FirstIPInt $FirstIP = ($FirstIP).GetAddressBytes() [Array]::Reverse($FirstIP) $FirstIP = [IPAddress]$FirstIP # Last usable IP $LastIPInt = ([IPAddress]$LastIPByteArray).Address - 1 $LastIP = [IPAddress]$LastIPInt $LastIP = ($LastIP).GetAddressBytes() [Array]::Reverse($LastIP) $LastIP = [IPAddress]$LastIP } } $AllIPs = [System.Collections.ArrayList]@() if ($ReturnAllIPs) { if ($UsableIPs -ge 500000) { Write-Warning ('ReturnAllIPs: Generating an array containing {0:N0} IPs, this may take a little while' -f $UsableIPs) } $CurrentIPInt = $FirstIPInt Do { $IP = [IPAddress]$CurrentIPInt $IP = ($IP).GetAddressBytes() [Array]::Reverse($IP) $IP = ([IPAddress]$IP).IPAddressToString [void]$AllIPs.Add($IP) $CurrentIPInt++ } While ($CurrentIPInt -le $LastIPInt) } $obj = [PSCustomObject]@{ NetworkId = ($NetworkId).IPAddressToString Broadcast = ($Broadcast).IPAddressToString SubnetMask = ($SubnetMask).IPAddressToString PrefixLength = $PrefixLength WildcardMask = ($WildcardMask).IPAddressToString FirstIP = ($FirstIP).IPAddressToString LastIP = ($LastIP).IPAddressToString TotalIPs = $TotalIPs UsableIPs = $UsableIPs AllIPs = $AllIPs } Write-Output $obj } |