googerteller/cidr.py

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#!/usr/bin/env -S python3 -u
import sys
from ipaddress import ip_network, ip_address
nets = []
with open("goog-prefixes.txt") as f:
nets = [line.strip() for line in f.readlines()]
for line in iter(sys.stdin.readline, ''):
line = line.strip()
for net in nets:
try:
if ip_address(line) in ip_network(net):
print(line)
continue
except:
continue