Compare-IPinSubnet.ps1
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<#PSScriptInfo .VERSION 1.0.0 .GUID 1d67ba06-2a20-4e05-8b63-8f8c30075c77 .AUTHOR saw-friendship .COMPANYNAME .COPYRIGHT .TAGS IPSubnet calc cidr .LICENSEURI .PROJECTURI https://sawfriendship.wordpress.com/ .ICONURI .EXTERNALMODULEDEPENDENCIES .REQUIREDSCRIPTS .EXTERNALSCRIPTDEPENDENCIES .RELEASENOTES #> <# .DESCRIPTION check that the address is in the IP Subnet .LINK https://sawfriendship.wordpress.com/2017/06/20/subnet-contains-ip/ .EXAMPLE Compare-IPSubnet -CIDR 8.8.0.0/16 -IP 8.8.8.8 True .EXAMPLE Get-NetRoute -AddressFamily IPv4 | ? {Compare-IPSubnet -CIDR $_.DestinationPrefix -IP 8.8.8.8} ifIndex DestinationPrefix NextHop RouteMetric ifMetric PolicyStore ------- ----------------- ------- ----------- -------- ----------- 8 8.8.0.0/16 192.168.0.201 1 25 ActiveStore 8 0.0.0.0/0 192.168.0.1 0 25 ActiveStore PS> .EXAMPLE Get-NetRoute -AddressFamily IPv4 | ? {Compare-IPSubnet -CIDR $_.DestinationPrefix -IP 8.8.8.8} | Select-Object -Property DestinationPrefix,NextHop,@{n='PrefixLength'; e = {$_.DestinationPrefix -replace '^[\d\.]+(\\|\/)',''}} | Sort-Object -Property PrefixLength -Descending | Select-Object -First 1 DestinationPrefix NextHop PrefixLength ----------------- ------- ------------ 8.8.0.0/16 192.168.0.201 16 #> param ( [string]$CIDR, [string]$IP ) [int]$PrefixLength = $CIDR -replace '^[\d\.]+(\\|\/)','' [string]$Subnet = $CIDR -replace '(\\|\/)\d+$','' $SplitSubnetBin = $Subnet -split '\.' -match '\d' | % {[convert]::ToString($_,2).PadLeft(8,'0')} $SubnetBin = $SplitSubnetBin -join '' $SplitIPBin = $IP -split '\.' -match '\d' | % {[convert]::ToString($_,2).PadLeft(8,'0')} $IPBin = $SplitIPBin -join '' [bool]$Result = $true for ($i = 0; $i -lt $PrefixLength; $i += 1) { [bool]$diff = [convert]::ToInt32(($SubnetBin[$i]),2) -eq [convert]::ToInt32(($IPBin[$i]),2) if ($diff -eq $false) { $Result = $diff } } $Result |