A python script to resolve a few registered bitcoin nodes from the DNS entries of some seed nodes.

bitcoin_seed_nodes.py

#!/usr/bin/env python3

from datetime import datetime
import dns.resolver
import time

# pip install --user dnspython
# https://bitcoin.stackexchange.com/questions/14371/what-is-a-dns-seed-node-vs-a-seed-node
# https://bitcoin.stackexchange.com/questions/2027/how-does-the-bitcoin-client-make-the-initial-connection-to-the-bitcoin-network/2030#2030

loops = 5
seeds = [
  "seed.bitcoin.sipa.be",
  "dnsseed.bluematt.me",
  "dnsseed.bitcoin.dashjr.org",
  "seed.bitcoinstats.com",
  "seed.bitcoin.jonasschnelli.ch",
  "seed.btc.petertodd.org",
  "seed.bitcoin.sprovoost.nl",
  "bitseed.xf2.org"
]

print("  # updated %s %s" % (datetime.now().strftime("%c"), __file__))
resolver = dns.resolver.Resolver()
hosts = set()
for seed in seeds:
  print("  # seed: " + seed)
  for _ in range(loops):
    answers = resolver.query(seed, "A")  # Lookup the 'A' record(s)
    hosts.update([a.address for a in answers])
    time.sleep(0.1)

for host in sorted(hosts):
  print("  - " + host)
print()

s = ""
for h in sorted(hosts):
    s += '"-connect=%s", ' % h
print(s)