nslookup-bulk.ps1

param(
    [Parameter(Mandatory=$true)]
    [string]$File
)

if (-not (Test-Path $File)) {
    Write-Host "File not found: $File"
    exit 1
}

Get-Content $File | ForEach-Object {
    $name = $_.Trim()
    if (-not $name -or $name.StartsWith('#')) { return }

    try {
        $result = Resolve-DnsName -Name $name -Type A -ErrorAction Stop
        $ips = $result | ForEach-Object { $_.IPAddress }
        Write-Host "$name -> $($ips -join ', ')"
    }
    catch {
        Write-Host "$name -> [no record]"
    }
}