code:

---

; begin MOAN
;
;!
Function moan($a,$b,$c)
    Dim $,$d,$e,$f,$g,$h,$m[3]
    $d="."

    ;Build Subnet Mask
    $f=0,128,192,224,240,248,252,254
    for $e=8 to 31
        $=$e
        $h=1
        for $g=0 to 3
            $m[$g]=iif($/8,255,$f[$ mod 8])
            $=($>8)*($-8)
            if $a & $b
               $h=$h & split($b,$d)[$g]=(0+split($a,$d)[$g] & $m[$g])
            endif
        next
        if $h
            $c=$c+" /"+$e
        endif
        if $e=$c
           $c=join($m,$d)
        endif
    next
    ;End build mask array
    if instr($c,$d)
        ;build array of input values by splitting a string. Then convert to integers
        ; Mask = $[0..3]   NetID = $[4..7]   IPaddr = $[8..11]
        $=split($c+$d+$b,$d)
        if $a
            ;Calculate NetworkID using $ array
            $c=""
            for $e=0 to 3
                $c=$c+$d+(0+$[$e] & 0+split($a,$d)[$e])
            next
            if $d+join(split($a),"")=$c
               $c=""
            endif

            ;Output: 1 if the IP is a member of a nework defined by network ID and subnet mask, otherwise 0
            ;Input NetworkID = Calculated NetworkID
            if $b
                $c=$d+join(split($b),"")=$c
            endif
        else
            ;Output: Network ID or empty string if no match
            ;Output: Array of all potential IP addresses or empty string if no match
            for $b=$[4] to 255 + $[4]  - $[0]
                for $h=$[5] to 255 + $[5] - $[1]
                    for $e=$[6] to 255 + $[6] - $[2]
                        for $f=1+$[7] to 254 + $[7] - $[3]
                            $a = $a+" "+$b+$d+$h+$d+$e+$d+$f
                        next
                    next
                next
            next
            $c=$a
        endif
    endif $=$c,split(substr($c,2))
    $moan=$[len($c)>1]
EndFunction
;!
;!
; end MOAN

---