using scapy to scan the network by sending/receiving ARP packets

arpscanner.py

import socket
from time import sleep
from scapy.layers.l2 import ARP, Ether
from scapy.all import *


def arpscan(network):
    ether = Ether(dst="ff:ff:ff:ff:ff:ff")
    for i in range(1,20):
        targetIP = network + str(i)
        arp = ARP(pdst=targetIP)
        arprcvd = srp1(ether/arp, timeout=2)
        if arprcvd is not None:
            print(f"IP: {arprcvd[0].psrc} | MAC: {arprcvd[0].hwsrc}")
            
        sleep(0.5)


def netscanner(network):
    # IP Address for the destination
    target_ip = network

    """ Create packets """
    # create ARP packet
    arp = ARP(pdst=target_ip)
    # create the Ether broadcast packet
    # ff:ff:ff:ff:ff:ff MAC address indicates broadcasting
    ether = Ether(dst="ff:ff:ff:ff:ff:ff")
    # stack them
    packet = ether/arp

    # send packets using srp() function which sends and receives packets at layer 2
    # set the timeout to 3 so the script won't get stuck
    result = srp(packet, timeout=3)[0]

    # a list of clients, we will fill this in the upcoming loop
    clients = []

    for sent, received in result:
        # for each response, append ip and mac address to `clients` list
        clients.append({'ip': received.psrc, 'mac': received.hwsrc})

   
    print("Devices found in the network:")
    print("IP" + " "*18+"MAC")
    for client in clients:
        print(f"{client['ip']:16}    {client['mac']}")


def main():
    hostname = socket.gethostname()
    ip = socket.gethostbyname(hostname)
    netid = ip[:ip.rfind(".")+1]
    # print(f"host: {hostname} | ip a: {ip} -> netID: {netid}")
    arpscan(netID)


if __name__ == "__main__":
    main()
    # netscanner("192.0.0.1/26")