import socket
import sys
from netaddr import IPNetwork

for ip in IPNetwork(sys.argv[1]):
        ip = str(ip)
        print ip
        try:
                s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
                s.settimeout(1)
                s.connect((ip,21))
                data = s.recv(1024)
                print data
                if "PCMan's FTP Server 2.0" in data:
                      print ("System is {} Vull".format(ip))
                      break
      except:
              pass

python vull.py 172.16.60.75
python vull.py 172.16.60.1/24