import socket, sys
dest = ('<broadcast>', 51423)
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST,1)
s.sendto("Hi", dest)
print "Looking for replies; press Ctrl-C to stop."
while 1:
  (buf, address) = s.recvfrom(2048)
  if not len(buf):
    break
  print "Received from %s: %s" % (address, buf)