Sort a list of IP addresses by count and IP.

SortIPsByCount.ps1

$ips = @(
"19.143.116.98"
"19.143.116.98"
"19.143.116.98"
"19.143.116.98"
"19.143.116.98"
"19.143.116.98"
"19.143.116.98"
"19.143.116.98"
"15.37.53.228"
"15.37.53.228"
"15.37.53.228"
"119.123.16.100"
"119.123.16.12"
"119.123.16.9"
"119.123.16.89"
)

$records = @()
foreach($ip in $ips) {
    $records += [pscustomobject]@{
        "IP" = $ip
        "Version" = [String]::Join('.',  ([System.Net.IPAddress]$ip).IPAddressToString.Split('.').PadLeft(3,'0'))
    }
}

$records | Group-Object -Property Version | 
    Sort-Object -Property Count, Name -Descending | 
    Select-Object -Property Count, @{"Label"="IP";"Expression"={$_.Group[0].IP}}