Clever Network Maths

networkMath.py

import sys
import os
import sqlite3
from ipaddress import IPv4Network
from socket import inet_ntoa, inet_aton
from struct import pack, unpack

def ip2long(ip_addr):
	return unpack("!L", inet_aton(ip_addr))[0]

def long2ip(ip):
	return inet_ntoa(pack("!L", ip))


cidrFromMask = lambda y: sum(bin(int(x)).count('1') for x in y.split('.'))
maskFromCidr = lambda y: '.'.join([str((0xffffffff << (32 - y) >> i) & 0xff) for i in [24, 16, 8, 0]])

print(maskFromCidr(30)) # -> 255.255.255.252