How 2 stop unapproved updates?

[J.P. Price]

How do I keep the following from happening?  Is there a port I can block?
What effect does the following have on my DNS?

Thanks in advance!

JP Price
Momentum Online

Apr 16 23:20:26 www named[333]: unapproved update from [204.96.222.33].3603
for 222.96.204.in-addr.a
rpa
Apr 16 23:30:28 www named[333]: unapproved update from [204.96.222.33].3644
for 222.96.204.in-addr.a
rpa
Apr 17 08:03:33 www named[333]: unapproved update from [204.96.222.56].4044
for 222.96.204.in-addr.a
rpa
Apr 17 08:57:44 www named[333]: unapproved update from [204.96.222.30].4331
for 222.96.204.in-addr.a
rpa
Apr 17 09:02:46 www named[333]: unapproved update from [204.96.222.30].4359
for 222.96.204.in-addr.a
rpa
Apr 17 09:12:49 www named[333]: unapproved update from [204.96.222.30].4403
for 222.96.204.in-addr.a
rpa
Apr 17 10:12:52 www named[333]: unapproved update from [204.96.222.30].4750
for 222.96.204.in-addr.a
rpa
Apr 17 10:17:54 www named[333]: unapproved update from [204.96.222.30].4803
for 222.96.204.in-addr.a
rpa
Apr 17 10:27:59 www named[333]: unapproved update from [204.96.222.30].4841
for 222.96.204.in-addr.a
rpa