#!/usr/bin/env python3

# Net discovery tool

import logging
logging.getLogger("scapy.runtime").setLevel(logging.ERROR)
from scapy.all import *
import sys

netw=input("\nEnter network address: ")

parts=netw.split(".")
if len(parts)<4 or len(parts)>4:
    print("invalid IP length should be 4 not greater or less than 4")
    sys.exit()
else:
    a=int(parts[0])
    b=int(parts[1])
    c=int(parts[2])
    d=int(parts[3])
    if a>=255 or a<0:
        print("A should not be 255 or greater than 255 or less than 0")
        sys.exit()
    elif b>=255 or b<0:
        print("B should not be 255 or greater than 255 or less than 0")
        sys.exit()
    elif c>=255 or c<0:
        print("C should not be 255 or greater than 255 or less than 0")
        sys.exit()
    elif d>=255 or d<0:
        print("D should not be 255 or greater than 255 or less than 0")
        sys.exit()

d=0
netw=str(a)+"."+str(b)+"."+str(c)+"."+str(d)
print("Network address ", netw)

for ip in range(1,255):
    conf.verb=0
    lip=netw[:-1]+str(ip)
    p=IP(dst=lip)/ICMP()
    resp=(sr1(p,timeout=0.01))
    if resp==None:
        pass
    elif resp.haslayer(ICMP):
        print(lip, "is up")