resolve IP address list to hostnames

Resolve-IPs.ps1

$IPs = import-csv C:\Scripts\Input\Dev_IPs_Final.csv
$zones = Get-DnsServerZone

#decided to use function instead of adding the results to an array
#when I did the array and tried to export to csv, it was all pissy because CSV needed objects and it kept outputting the line length
function Resolve-IPs{
    param (
    $IPs,
    $zones
    )
    foreach ($z in $cdmig)
    {
        foreach ($i in $IPs)
        {
        $allips=$i.ip.Split(",")
            if($allips.Count -gt "1")
            {
                #adding a temporary array here to store the string return
                $temp = @()
                foreach ($a in $allips)
                {
                    $record = Get-DnsServerResourceRecord -ZoneName $z.ZoneName -RRType A | ? {$_.recorddata.ipv4address -like $a}
                    #make sure that a record was found, otherwise don't add it
                    if ($record) {
                        #adding the hostname to the IP address in the format HOSTNAME:IPADDRESS
                        $temp += "$($record.hostname):$a"
                    }
                }
                #this is where it keeps all the same IPs on the same line --- by joining the temporary array together with commas!
                New-Object -TypeName PSObject -Property @{IP = $temp -join ","}
                #also by using function you can just create the object and it'll be outputted by the function instead of having to store it
            }
            else
            {
                $record = Get-DnsServerResourceRecord -ZoneName $z.ZoneName -RRType A | ? {$_.recorddata.ipv4address -like $i.ip}
                #if its only one entry it'll just output it
                New-Object -TypeName PSObject -Property @{IP = "$($record.hostname):$($i.ip)"}
                #again no storing it, just use the output later
            }
        }
    } 
}


Resolve-IPs -IPs $IPs -zones $zones | export-csv C:\scripts\output\iptohostname.csv -NoTypeInformation

#change zones param if you want to filter zones down 
#$netbiosname = $zones | where {$_.zonename -eq "company.com"}

#checking the import csv to make sure it wokrs.  
$output = import-csv C:\scripts\output\iptohostname.csv

#just some pull practice
#another after Branch