A little script that uses dnspython to verify a dns migration. The first server must allow dns axfr.

check-dns.py

import sys, difflib, pprint
import dns.resolver

my_resolver = dns.resolver.Resolver()
# 8.8.8.8 is Google's openDNS server
my_resolver.nameservers = [sys.argv[2]]
import dns.query
import dns.zone
differ = difflib.Differ()
for domain in sys.argv[3:]:
  z = dns.zone.from_xfr(dns.query.xfr(sys.argv[1], domain))
  names = z.nodes.keys()
  names.sort()
  for n in names:
      for record in z[n].rdatasets:
          query = '%s.' % n.to_text()
          if query == '@.':
              query = ''
          record_text = record.to_text(n)
          #print 'Asking %s for %s' % (str(my_resolver.nameservers), '%s%s' % (query, domain))
          try:
            answer = my_resolver.query('%s%s' % (query, domain), record.rdtype)
            answer_text = answer.rrset.to_text().replace('.%s.' % domain, '')
            answer_text = '\n'.join(sorted(answer_text.splitlines()))
            record_text = record_text.replace('@', '%s.' % domain)
            record_text = '\n'.join(sorted(record_text.splitlines()))
            if record_text.lower() != answer_text.lower():
                print "(%s, %s) doesn't match!" % (query, domain)
                pprint.pprint(list(differ.compare(record_text.splitlines(), answer_text.splitlines())))
                print "-" * 50
          except dns.resolver.NoNameservers, e:
            print "Can't find %s%s!" % (query, domain)
            print "-" * 50