Powershell - Find IP range for device

This was a pre-check for client computers about the be ADMT'ed to a new domain. The back story is a computer could be on a wired connection, a few WIFI networks which some had domain connectivity and some did not, and 4g/Home connection and direct access. At the point of migrate we bumped out the laptops that were going to fail, this was just a pre-check.

This was just a report so we could chase the user to correct the problem.

This script could be much easier in Windows 10 due to new functions (ip v6), but I did not have the option.

$computers = Import-Csv C:\temp\computerlist.txt

ipconfig /flushdns > null

#cls

foreach ($computers in $computers){

$ThisComputer=$computers.computername.trim()

$NoMigComputer=$ThisComputer + ".old.gov.au"

$testcon = " NOT reachable"

$didit = Test-Connection $NoMigComputer -count 1 -quiet

if ($didit -ne $false)

{$testcon = "and is contactable"}

#write-host Attempt to look at $NoMigComputer

try {

$result = $null

$JustIP = $null

$result = [System.Net.Dns]::GetHostAddresses($NoMigComputer)

$JustIP = $result.ipaddresstostring

if ($result -eq $null)

    {    write-host $NoMigComputer " is not in DNS"    }

else

    {

    #write-host $NoMigComputer" IP is" $JustIP

        if

        (

        $JustIP -like '192.22.124.*' -or

        $JustIP -like '192.28.126.*' -or

        $JustIP -like '192.22.234.*'

        )

        {

        write-host $NoMigComputer $JustIP  "wired" $testcon

        }

        else

        {

        write-host $NoMigComputer $JustIP "is on WIFI" $testcon

        } } }

catch {

$YesMigComputer=$ThisComputer + ".ic.nsw.gov.au"

try {

$Yesresult = [System.Net.Dns]::GetHostAddresses($YesMigComputer)

}

catch {

#$YesMigComputer + " not in IC domain EITHER"

}

$JustIP = $result.ipaddresstostring

if ($JustIP -eq $null)

    {

    write-host $NoMigComputer "is not in DNS *V4"

    }

if ($NoMigComputer -eq $null)

{

Write-host $NoMigComputer "On 4G connection"

} } }