bind 서버에러

아래와 같은 에러 메시지가 계속 쌓이는데 원인이 몰까여???

아래에 보이는 도메인은 모두 저희가 운영하고 있는 도메인 입니다.

Jun 28 14:52:00 ns1 named[220]: [ID 295310 daemon.notice] unapproved update from
 [211.63.74.21].1350 for koreandirectory.com.au
Jun 28 14:53:05 ns1 named[220]: [ID 295310 daemon.notice] unapproved update from
 [211.237.40.245].2711 for 40.237.211.in-addr.arpa
Jun 28 14:59:56 ns1 named[220]: [ID 295310 daemon.notice] unapproved update from
 [211.63.74.1].1352 for webcodi.com
Jun 28 14:59:56 ns1 named[220]: [ID 295310 daemon.notice] unapproved update from
 [211.63.74.1].1358 for webcodi.com
Jun 28 14:59:56 ns1 named[220]: [ID 295310 daemon.notice] unapproved update from
 [211.63.74.1].1364 for webcodi.com
Jun 28 15:00:13 ns1 named[220]: [ID 295310 daemon.notice] unapproved update from
 [211.196.249.214].1181 for webcodi.com
Jun 28 15:03:30 ns1 named[220]: [ID 295310 daemon.notice] unapproved update from
 [211.63.74.5].4392 for webcodi.com
Jun 28 15:03:30 ns1 named[220]: [ID 295310 daemon.notice] unapproved update from
 [211.63.74.5].4406 for 74.63.211.in-addr.arpa
Jun 28 15:04:29 ns1 named[220]: [ID 295310 daemon.notice] unapproved update from
 [211.63.74.15].3816 for webcodi.com
Jun 28 15:04:29 ns1 named[220]: [ID 295310 daemon.notice] unapproved update from
 [211.63.74.15].3830 for 74.63.211.in-addr.arpa
Jun 28 15:08:30 ns1 named[220]: [ID 295310 daemon.notice] unapproved update from
 [211.63.74.5].4421 for webcodi.com
Jun 28 15:08:30 ns1 named[220]: [ID 295310 daemon.notice] unapproved update from
 [211.63.74.5].4435 for 74.63.211.in-addr.arpa

Jun 28 15:09:29 ns1 named[220]: [ID 295310 daemon.notice] unapproved update from
 [211.63.74.15].3874 for 74.63.211.in-addr.arpa
Jun 28 15:09:29 ns1 named[220]: [ID 295310 daemon.notice] unapproved update from
 [211.63.74.73].3432 for webcodi.com
Jun 28 15:09:29 ns1 named[220]: [ID 295310 daemon.notice] unapproved update from