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File Content: `query_specific.py`

#!/usr/bin/env python3

# Two ways of querying a specific nameserver.

import dns.message
import dns.rdataclass
import dns.rdatatype
import dns.query

# This way is just like nslookup/dig:

qname = dns.name.from_text("amazon.com")
q = dns.message.make_query(qname, dns.rdatatype.NS)
print("The query is:")
print(q)
print("")
r = dns.query.udp(q, "8.8.8.8")
print("The response is:")
print(r)
print("")
print("The nameservers are:")
ns_rrset = r.find_rrset(r.answer, qname, dns.rdataclass.IN, dns.rdatatype.NS)
for rr in ns_rrset:
    print(rr.target)
print("")
print("")

# A higher-level way:

import dns.resolver

answer = dns.resolver.resolve_at("8.8.8.8", "amazon.com", "NS")
print("The nameservers are:")
for rr in answer:
    print(rr.target)
print("")
print("")

# If you're going to make a bunch of queries to the server, make the resolver once
# and then use it multiple times:

res = dns.resolver.make_resolver_at("dns.google")
answer = res.resolve("amazon.com", "NS")
print("The amazon.com nameservers are:")
for rr in answer:
    print(rr.target)
answer = res.resolve("google.com", "NS")
print("The google.com nameservers are:")
for rr in answer:
    print(rr.target)
print("")
print("")

# Sending a query with the all flags set to 0.  This is the easiest way
# to make a query with the RD flag off.
#
# This sends a query with RD=0 for the root SOA RRset to the IP address
# for l.root-servers.net.

q = dns.message.make_query(".", dns.rdatatype.SOA, flags=0)
r = dns.query.udp(q, "199.7.83.42")
print("\nThe flags in the response are {}".format(dns.flags.to_text(r.flags)))
print('The SOA in the response is "{}"'.format((r.answer)[0][0]))

Name	Size	Permission
async_dns.py	874 bytes	0644
ddns.py	1194 bytes	0644
ddr.py	950 bytes	0644
doh-json.py	3001 bytes	0644
doh.py	534 bytes	0644
doq.py	3143 bytes	0644
e164.py	115 bytes	0644
ecs.py	450 bytes	0644
edns.py	1739 bytes	0644
edns_resolver.py	1532 bytes	0644
mx.py	189 bytes	0644
name.py	356 bytes	0644
query_specific.py	1655 bytes	0644
receive_notify.py	1022 bytes	0644
reverse.py	1389 bytes	0644
reverse_name.py	140 bytes	0644
send_notify.py	2462 bytes	0644
wire_read_tcp.py	1659 bytes	0644
xfr.py	340 bytes	0644
zonediff.py	12173 bytes	0644

File Content: query_specific.py

File Content: `query_specific.py`