Test-IPInSubnet.ps1

Test-IPInSubnet.ps1

function Test-IPInSubnet {
	[CmdletBinding()]
	param(
		[Parameter(Mandatory,Position=0)] 
		[string]$IP,
		[Parameter(Mandatory,Position=1)] 
		[string[]]$Subnet
	)

	$IPval = ([ipaddress]$IP).Address

	foreach ($cidr in $Subnet) {
		$netStr, $maskStr = $cidr.Split('/')
		$net = ([ipaddress]$netStr).Address
		$mask = [ipaddress]::HostToNetworkOrder(-1 -shl (32 - [int]$maskStr))

		if (($net -band $mask) -eq ($IPval -band $mask)) {
			return $True
		}
	}

	return $False
}