netaggr.py

#!/usr/bin/env python3
"""Generate aggregated network list from given file"""

import sys
from netaddr import IPSet, IPNetwork

def main(argv):
    ipset = IPSet()

    try:
        with open(argv[1], 'r') as file_desc:
            for line in file_desc.readlines():
                ipset.add(IPNetwork(line))
    except Exception as error:
        print(error)
        sys.exit(1)

    aggr_networks = [str(n) for n in ipset.iter_cidrs()]
    print('\n'.join(aggr_networks))

if __name__ == "__main__":
    main(sys.argv)