import os
import re
os.system("nmap -sP 192.168.3.0/24") //掃描IP
mac = os.popen("cat /proc/net/arp ").readlines() //按行讀取
length = len(mac)
for i in range(1,length):
    b= re.split(r" +",mac[i])  //按照多個空格分割
    if(b[2]=='0x2'):
        print b[3]