CODEWITHSUNDEEP
pythonip-address
user13185880
user13185880

Reputation:

How to find Network ID

I want to find the network id using the bitwise operation between ipaddress and and subnetmask in python. I want to go with this traditional method my sample code is here

hostname=input("Enter the IP Address: ")
print(hostname)
if hostname >= "0.0.0.0" and hostname <= "127.255.255.255":
    print("Class A")
    print("The default subnet mask is: 255.0.0.0")
    j=(hostname & 255.0.0.0)
    print("The network id is ",j)

Upvotes: 0

Views: 1394

Answers (1)

rite2hhh
rite2hhh

Reputation: 412

Since you are taking input, always ensure you sanitize the input. use ipaddress.ip_interface() or ipaddress.ip_network() to make sure the input given is a valid IP first.

Also your input hostname is a string, so the bitwise operation will fail.

Once you use ipaddresss.ip_address(hostname), you'll get an IPv4Address object which will allow you to check numerous properties.

There are other helper functions in ipaddress standard package for taking CIDR values and creating IPvXNetwork objects as well, maybe that's what you are looking for, check ipaddress HOW-TO

It would be roughly as follows:

import ipaddress

try:
    inp = input("Enter the IP Address: ")
    iface = ipaddress.ip_interface(inp)
except ValueError as e:
    # crude way of handling and printing errors
    # there are elegant ways to handle and proceed
    print(e)
    exit(1)
else:
    netword_id = iface.network
    hostname = iface.ip

NOTE: I made some edits to the original answer, you probably want to use ipaddress.ip_interface()

Upvotes: 1

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