Writing Network Tools with Python (Part 1: DNS Resolution)
In this article, we'll be taking a look at a few ways in which Python can make your life easier. All of the examples in this part will pertain to DNS.
In this article, we'll be taking a look at a few ways in which Python can make your life easier. All of the examples in this part will pertain to DNS.
Environment:
- Python 2.7
- dnspython==1.16.0
Resolve A Records (FQDN or Host to IPv4 Address)
from dns import resolver
results = resolver.query('0.pool.ntp.org', 'A')
for result in results:
print(result)
103.105.51.156 138.197.114.122 45.33.103.94 71.255.99.178
Resolve AAAA Records (FQDN or Host to IPv6 Address)
from dns import resolver
results = resolver.query('cnn.com', 'AAAA')
for result in results:
print(result)2a04:4e42::323 2a04:4e42:200::323 2a04:4e42:400::323 2a04:4e42:600::323
Resolve PTR Records (Reverse Lookup; IPv4 to FQDN)
from dns import reversename, resolver
results = resolver.query(reversename.from_address('10.1.1.100'), 'PTR')
for result in results:
print(result)gitlab.example.com.
Resolve MX Records (Mail Servers for Domain)
from dns import resolver
results = resolver.query('gmail.com', 'MX')
for result in results:
print(result)30 alt3.gmail-smtp-in.l.google.com. 40 alt4.gmail-smtp-in.l.google.com. 5 gmail-smtp-in.l.google.com. 10 alt1.gmail-smtp-in.l.google.com. 20 alt2.gmail-smtp-in.l.google.com.
Check if Domain is a Super or Sub Domain
from dns import name
print(name.from_text('www.tyler-wright.com').is_subdomain(name.from_text('tyler-wright.com')))True
from dns import name
print(name.from_text('www.tyler-wright.com').is_superdomain(name.from_text('tyler-wright.com')))False
