ipv4_negate.py

#!/usr/bin/env python3
import ipaddress

ips = [ipaddress.ip_network('0.0.0.0/0')]
exts = map(ipaddress.ip_network,·
'''
10.0.0.0/8
172.16.0.0/12
192.168.0.0/16
127.0.0.0/8                                                                                                                              
'''.strip().splitlines())

def negate(ips, negate_ip):
    new_ips = []
    for ip in ips:
         new_ips += list(ip.address_exclude(negate_ip)) if ip.overlaps(ext) else [ip]
    return new_ips

for ext in exts:
    ips = negate(ips, ext)

for ip in ips:
    print(ip)