Clean out Mobile devices from your DHCP by using a powershell script.

CleanOutAndroidAndMobilePhones

#Put your server Scope
$scope = "192.168.1.0" 
#Put your DHCP Server Name
$dhcpserver = "dhcpserver.contoso.com"
#Fileshare unc path.  Your Shared CSV file should have atleast one column Mac with the Mac-Address in the format E0-19-27-42-92-AC
$AllowedList = "\\shareserver\ITSoftware\MacAddress.csv"

#Get Active Leases
$leases = Get-DhcpServerv4Lease -ComputerName $dhcpserver -ScopeId $scope |  Where-Object {$_.HostName -like 'android-*' -or $_.HostName -like 'Windows-*' -or $_.HostName -like '*Nokia*' -or $_.HostName -like '*Phone*'}
#Get Allowed CSV put this file in a shared folder and put in CSV file name here
if((Get-Content $AllowedList) -eq $Null){
Write-Host "No Whitelist Found Stopping as this will delete all Mobile Leases"
exit
}
$csv = Import-Csv $AllowedList

ForEach ($lease in $leases ){
#Check if lease is whitelisted in Shared CSV file
$found = $csv | where {$_.Mac -eq $lease.ClientId.ToUpper()} 
if($found){
    Write-Host "Skipping Allowed User"  
}else{
    #Remove-DhcpServerv4Lease -ComputerName $dhcpserver -ScopeId $scope -ClientId $lease.ClientId
    #Add-DhcpServerv4Filter -List Deny -MacAddress $lease.ClientId  -ComputerName $dhcpserver
}


}