Python - Generate a list of IP addresses from user input

Question

I am trying to create a script that generates a list of IP addresses based on a users input for a start and end IP range. For example, they could enter 192.168.1.25 & 1

Answer 1

Remember that a dotted IPv4-address "x.x.x.x" is nothing more than a human-readable representation of a 32-bit integer. Using this, you can generate the ranges like this:

def undotIPv4 (dotted):
    return sum (int (octet) << ( (3 - i) << 3) for i, octet in enumerate (dotted.split ('.') ) )

def dotIPv4 (addr):
    return '.'.join (str (addr >> off & 0xff) for off in (24, 16, 8, 0) )

def rangeIPv4 (start, stop):
    for addr in range (undotIPv4 (start), undotIPv4 (stop) ):
        yield dotIPv4 (addr)

for x in rangeIPv4 ('1.2.3.4', '1.2.4.22'):
    print (x)