Sometimes you might have network or firewall issues in an internal that require a network scan to find which IP addresses are in use. For that purpose, we can use ready-made tools such as nmap, zmap or angryIP. But if we have no internet access to download these tools we can do the scan by only using manual commands. However, the manual scanning can be quite tedious, with the understanding that should be done for each IP address given on our network.

import sys, subprocess
if len(sys.argv)<>2:
print “networkmonitor 10.0.0.”
else:
cmdping =”ping -c1 “+sys.argv[1]
for x in range(99,110):
p = subprocess.Popen(cmdping+str(x), shell=True, stderr=subprocess.PIPE)
while True:
out = p.stderr.read(1)
if out == ” and p.poll() != None:
break
if out != ”:
sys.stdout.write(out)
sys.stdout.flush()