local_computers_scanner.py

#!/usr/bin/env python3

import socket
import subprocess
import os
import netifaces

debug = True

def start():
	# Get gateway ip
	gws = netifaces.gateways()['default']
	gwid = next (iter (gws))
	gatewayip = gws[gwid][0]

	if debug == True:
		print("Gateway ip: " + gatewayip)

	# Prepare basemask
	depth = 3 # Doesn't look for devices below 255.255.255.0
	baseip = gatewayip.split('.')
	basemask = ""
	for i in range(3):
		basemask += baseip[i] + "."

	# Find all devices
	connected_ips = find_devices(basemask)
	print("Connected devices: " + str(connected_ips))

def find_devices(basemask):
	connected_ips = []
	for i in range(255):
		ip = basemask + str(i)
		try:
			socket.gethostbyaddr(ip)
			connected_ips.append(ip)
			if debug == True:
				print("Found device: " + ip)
		except socket.herror:
			if debug == True:
				print("Unknown host: " + ip)
	return connected_ips

if __name__ == '__main__':
	start()

My fork now returns the correct netmask on windows. But the recursion, test_rec(mask, depth), doesn't return in a reasonable amount of time.

Should be fixed now, try again