I want to learn about exception handling in power shell I am reading and looking over the script now and really dont know what i am doing !

I want this script to just list the found ips and then if it does not find them return a "*"
right now when I run it I get

I am not sure this is even an "exception"

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nd
 
Test-Connection : Testing connection to computer '192.168.5x.39' failed: A non-recoverable error occurred during a database lookup
At C:\Users\Bks\Desktop\ipscan.ps1:8 char:47
+     $startip..$endip | foreach{test-connection <<<<  -ComputerName $startsubnet$_ -count 1} | select -expandproperty ipv4address | select -expandproperty ipaddresstostring | foreach{[System.Net.Dns]::GetHostByAddr
ess("$_")}
    + CategoryInfo          : ResourceUnavailable: (192.168.5x.39:String) [Test-Connection], PingException
    + FullyQualifiedErrorId : TestConnectionException,Microsoft.PowerShell.Commands.TestConnectionCommand
 
T$startrange = read-host "Enter a start IP"
$endrange = read-host "Enter an end IP"
$startsubnet = "$($startrange.Split(".")[0]).$($startrange.Split(".")[1]).$($startrange.Split(".")[2])."
$endsubnet = "$($endrange.Split(".")[0]).$($endrange.Split(".")[1]).$($endrange.Split(".")[2])."
if ($startsubnet -eq $endsubnet) {
    $startip = $($startrange.Split(".")[3])
    $endip = $($endrange.Split(".")[3])
    $startip..$endip | foreach{test-connection -ComputerName $startsubnet$_ -count 1} | select -expandproperty ipv4address | select -expandproperty ipaddresstostring | foreach{[System.Net.Dns]::GetHostByAddress("$_")}
} else {
    write-host "Start subnet was not the same as the end subnet"
}