Resolve DNS Names

resolver.py

#!/usr/bin/env python3

#-----------------------------------------------------------------------------
# This is free and unencumbered software released into the public domain.
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# this software, either in source code form or as a compiled binary, for any
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#-----------------------------------------------------------------------------
# To use this software you will need to install dnspython3.
#    pip3 install dnspython3
#-----------------------------------------------------------------------------
import sys
import csv
import dns.resolver
import dns.exception

resolver = dns.resolver.Resolver()
resolver.nameservers = ['208.67.222.222', '208.67.220.220']


def resolve(fqdn, rtype='A'):
    """
    Resolve a DNS query.

    Query the DNS server for a record of type rtype. The default is A records.
    """
    # Resolve our query and return a list of answers. If there are any
    # exceptions, print the exception and return an empty list.
    ips = []
    try:
        ans = resolver.query(fqdn, rtype)
        ips = [a.to_text() for a in ans]

    except dns.exception.DNSException:
        pass

    return ips


def write_records(records):
    with open('lookup_results.csv', 'w') as csvfile:
        writer = csv.writer(csvfile)
        for record in records:
            writer.writerow([record, '|'.join(records[record])])


def get_domains(filename):
    """
    Get the wordlist from the file.
    """
    wordlist = []
    with open(filename) as f:
        for line in f:
            line = line.rstrip()

            if (line != '') and (line[0] != '#'):
                wordlist.append(line)

    return wordlist


def usage():
    print('Usage: resolver.py domain_name_list')
    sys.exit(1)


if __name__ == '__main__':
    if len(sys.argv) != 2:
        usage()

    domains = get_domains(sys.argv[1])
    records = {}

    for domain in domains:
        ips = resolve(domain)
        ips.extend(resolve(domain, 'AAAA'))
        records[domain] = ips

    write_records(records)

USAGE

$ ./resolver.py names.txt 
$ cat lookup_results.csv 
www.live.com,207.46.11.252|65.55.129.171
www.asgconsulting.com,185.53.179.7
www.google.com,74.205.129.15|74.205.129.38|74.205.129.29|74.205.129.44|74.205.129.27|74.205.129.42|74.205.129.23|74.205.129.49|74.205.129.59|74.205.129.57|74.205.129.53|74.205.129.34|74.205.129.45|74.205.129.30|74.205.129.19|2607:f8b0:4002:c06::6a
www.outlook.com,132.245.75.194|132.245.78.146|132.245.9.226|132.245.3.210|132.245.23.146|132.245.29.242|132.245.71.18|132.245.60.2|132.245.44.226|40.96.8.2|2a01:111:f400:50aa::2|2a01:111:f400:5374::2|2a01:111:f400:516d::2|2a01:111:f400:52ef::2|2a01:111:f400:2ea1::2|2a01:111:f400:53eb::2|2a01:111:f400:f20d::2|2a01:111:f400:2a::2|2a01:111:f400:16::2|2a01:111:f400:4000::2
www.yahoo.com,98.139.180.149|98.139.183.24|2001:4998:58:c02::a9