You could just nest a few FOR - NEXT loops.
Code:
Break on
$Pre="10.198."
$Oct3="10.","40.","50.","51.","54.","65.","70."
For each $Oct in $Oct3
	For $Oct4=0 to 255
		$ShellCMD="C:\KiXScripts\portchek "+$Pre+$Oct+$Oct4+" 36794"
		Shell $ShellCMD
		If @error
			"No listener on port 36794 of "+$Pre+$Oct+$Oct4 ?
		Else
			"YIKES! LISTENER FOUND ON PORT 36794 OF "+$Pre+$Oct+$Oct4 ?
			Beep
		EndIf
	Next
Next
"That's all folks!"?
Get $_
_________________________
Give a man a fish and he will be back for more. Slap him with a fish and he will go away forever.