How to find out how many clients are on a certain address range?

Question

I tried googling for this but i didnt find anything... I am building a port scanner and i would like to make it so, that i can scan a network range e.g 192.168.2.* and find out how many computers are on that range that are online. Alot like Nmap. I am programming in python. Is this possible in Python?

Answer 1

Here is Draft example that you can start with:

import socket

addr_range = "192.168.1.%d"

ip_address_up = []

# Use UDP. 
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

s.settimeout(2.0)

for i in range(1, 254):
    try:
        ip = addr_range % i
        socket.gethostbyaddr(ip)
        ip_address_up.append(ip)
    except socket.herror as ex:
        pass

print ip_address_up

or something like this using ICMP (ping) rather thank UDP:

import socket
import ping

ip_address_up = []

addr_range = "192.168.1.%d"

for i in range(1, 254):       
   try:
       ip = addr_range % i
       delay = ping.do_one(ip, timeout=2)
       ip_address_up.append(ip)
   except (socket.herror, socket.timeout) as ex:
       pass

print ip_address_up