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