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ndaidong/ip_count_from_netmask.py

Last active October 8, 2019 03:49
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Counting number of IP belongs to a subnetmask
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ip_count_from_netmask.py
#!/usr/bin/env python3
from functools import reduce
from collections import Counter
def ip_count(netmask):
tmp = list(map(lambda x: bin(int(x)), netmask.split('.')))
arr = list(reduce(lambda x, y: x + y, tmp))
counter = Counter(arr)
return counter['1']
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ndaidong commented Oct 8, 2019 •
edited
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Usage

examples = [
    '255.255.255.255',
    '255.255.255.8',
    '255.255.255.0',
    '255.255.0.0',
    '255.0.0.0'
]

for ex in examples:
    no = ip_count(ex)
    print(f'Subnetmask {ex} --> No. of IPs {no}')

Result:

Subnetmask 255.255.255.255 --> No. of IPs 32
Subnetmask 255.255.255.8 --> No. of IPs 25
Subnetmask 255.255.255.0 --> No. of IPs 24
Subnetmask 255.255.0.0 --> No. of IPs 16
Subnetmask 255.0.0.0 --> No. of IPs 8

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