A partial parser for DHCP options in Windows

Get-DhcpClientOption.ps1

function Get-DhcpClientOption {
    [CmdletBinding()]
    param ( )

    $adapters = Get-CimInstance Win32_NetworkAdapterConfiguration -Filter 'IPEnabled=TRUE AND DhcpEnabled=TRUE'
    foreach ($adapter in $adapters) {
        $params = @{
            LiteralPath = Join-Path 'HKLM:\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces' -ChildPath $adapter.SettingID
            Name        = 'DhcpInterfaceOptions'
        }
        $dhcpInterfaceOptions = Get-ItemPropertyValue @params
        $reader = [System.IO.BinaryReader][System.IO.MemoryStream][Byte[]]$dhcpInterfaceOptions
        do {
            $code, $null = $reader.ReadBytes(8)
            $length, $null = $reader.ReadBytes(4)
            $vendor, $null = $reader.ReadBytes(4)
            $null = $reader.ReadBytes(4)
            $value = $reader.ReadBytes($length)

            [PSCustomObject]@{
                Code   = $code
                Length = $length
                Vendor = $vendor
                Value  = $value
            }
        } while ($reader.BaseStream.Position -lt $reader.BaseStream.Length)
        $reader.Dispose()
    }
}