Do the dnswalk...

Example output

Checking chaplinsbar.se.
Getting zone transfer of chaplinsbar.se. from ns1.g9dns.net...done.
SOA=ns1.g9dns.net contact=registry.g9dns.net
WARN: www.ftp.chaplinsbar.se A 82.96.16.171: no PTR record
WARN: www.nyhetsbrev.chaplinsbar.se A 82.96.16.171: no PTR record
WARN: nyhetsbrev.chaplinsbar.se A 82.96.16.171: no PTR record
WARN: chaplinsbar.se A 82.96.16.173: no PTR record
WARN: www.nyhetsmail.chaplinsbar.se A 82.96.16.171: no PTR record
WARN: nyhetsmail.chaplinsbar.se A 82.96.16.171: no PTR record
WARN: ftp.chaplinsbar.se A 82.96.16.171: no PTR record
WARN: www.chaplinsbar.se A 82.96.16.173: no PTR record
0 failures, 8 warnings, 0 errors.

What is dnswalk?

Dnswalk is a DNS debugger, used in unix based systems commonly. It performs zone transfers of specified domains, and checks the database in many ways for internal consistency, as well as accuracy.