pfn

    Page frame number (PFN) of the physical page for which
    information is to be displayed.

 end-pfn

    Last PFN to be displayed. When you specify the end-pfn parameter,
    a range of PFNs is displayed. This range starts at the PFN
    specified by the pfn parameter and ends with the PFN specified
    by the end-pfn parameter.

 length

    Length of the PFN list to be displayed. When you specify the
    length parameter, a range of PFNs is displayed. This range starts
    at the PFN specified by the pfn parameter and contains the number
    of entries specified by the length parameter.