Get-ClusterNetworkFQDN.ps1

[cmdletbinding()]
param(
    [string]
    $VMName
)
$scriptBlock = {
    $clusterNetworkNames = Get-ClusterResource | Where-Object ResourceType -eq 'Network Name'
    foreach ($n in $clusterNetworkNames) {
        if ($n.Name -match 'SQL Network Name') {
            $hostValue = $n.Name.TrimStart('SQL Network Name (').TrimEnd(')')
            $fqdn = [System.Net.Dns]::GetHostByName($hostValue).Hostname
        } else {
            $fqdn = [System.Net.Dns]::GetHostByName($n.Cluster).Hostname
        }
        [pscustomobject]@{
            ClusterName = $n.Cluster
            Name        = $n.Name
            OwnerNode   = $n.OwnerNode
            FQDN        = $fqdn
        }
    }
}
try {
    Invoke-Command -ComputerName $VmName -ScriptBlock $scriptBlock -ErrorAction Stop | Format-Table ClusterName, Name, OwnerNode, FQDN
} catch {
    throw "Issue connecting to $VMName - $($_)"
}