Error messages in /var/log/messages

[Kayvan A. Sylvan]

Does anyone know what this is? It looks like a hack attempt:

Apr 29 04:04:26 satyr named[1449]: unapproved update from [63.16.250.83].16989 for sylvan.com
Apr 29 04:05:31 satyr named[1449]: unapproved update from [63.16.250.83].17001 for sylvan.com
Apr 29 04:06:34 satyr named[1449]: unapproved update from [63.16.250.83].17011 for sylvan.com
[...]
Apr 29 06:25:49 satyr named[1449]: unapproved update from [63.16.250.77].18761 for sylvan.com
Apr 29 06:26:53 satyr named[1449]: unapproved update from [63.16.250.77].18774 for sylvan.com
Apr 29 06:27:58 satyr named[1449]: unapproved update from [63.16.250.77].18789 for sylvan.com
[...]
May  4 08:16:08 satyr named[1449]: unapproved update from [63.16.250.118].60233 for sylvan.com
May  4 08:17:21 satyr named[1449]: unapproved update from [63.16.250.118].60246 for sylvan.com
May  4 08:18:37 satyr named[1449]: unapproved update from [63.16.250.118].60265 for sylvan.com
May  4 08:21:26 satyr named[1449]: unapproved update from [63.16.250.105].60441 for sylvan.com
May  4 08:21:27 satyr named[1449]: unapproved update from [63.16.250.105].60470 for sylvan.com
May  4 08:21:27 satyr named[1449]: unapproved update from [63.16.250.105].60479 for sylvan.com
May  4 08:21:27 satyr named[1449]: unapproved update from [63.16.250.105].60482 for sylvan.com
May  4 08:21:27 satyr named[1449]: unapproved update from [63.16.250.105].60484 for sylvan.com
May  4 08:21:32 satyr named[1449]: unapproved update from [63.16.250.105].60525 for sylvan.com
May  4 08:21:33 satyr named[1449]: unapproved update from [63.16.250.105].60533 for sylvan.com
May  4 08:22:31 satyr named[1449]: unapproved update from [63.16.250.105].60562 for sylvan.com
May  4 08:23:36 satyr named[1449]: unapproved update from [63.16.250.105].60581 for sylvan.com
May  4 08:24:40 satyr named[1449]: unapproved update from [63.16.250.105].60591 for sylvan.com
May  4 08:25:44 satyr named[1449]: unapproved update from [63.16.250.105].60602 for sylvan.com
May  4 08:26:48 satyr named[1449]: unapproved update from [63.16.250.105].60612 for sylvan.com
May  4 08:27:53 satyr named[1449]: unapproved update from [63.16.250.105].60623 for sylvan.com
May  4 08:28:59 satyr named[1449]: unapproved update from [63.16.250.105].60645 for sylvan.com
May  4 08:30:04 satyr named[1449]: unapproved update from [63.16.250.105].60656 for sylvan.com
May  4 08:31:11 satyr named[1449]: unapproved update from [63.16.250.105].60667 for sylvan.com
May  4 08:32:14 satyr named[1449]: unapproved update from [63.16.250.105].60677 for sylvan.com
May  4 08:33:18 satyr named[1449]: unapproved update from [63.16.250.105].60693 for sylvan.com
May  4 08:34:22 satyr named[1449]: unapproved update from [63.16.250.105].60708 for sylvan.com
May  4 08:35:26 satyr named[1449]: unapproved update from [63.16.250.105].60719 for sylvan.com
May  4 08:36:30 satyr named[1449]: unapproved update from [63.16.250.105].60729 for sylvan.com
May  4 08:37:34 satyr named[1449]: unapproved update from [63.16.250.105].60740 for sylvan.com
May  4 08:38:38 satyr named[1449]: unapproved update from [63.16.250.105].60753 for sylvan.com
May  4 08:39:42 satyr named[1449]: unapproved update from [63.16.250.105].60764 for sylvan.com
May  4 08:40:46 satyr named[1449]: unapproved update from [63.16.250.105].60774 for sylvan.com
May  4 08:41:50 satyr named[1449]: unapproved update from [63.16.250.105].60787 for sylvan.com
May  4 08:42:54 satyr named[1449]: unapproved update from [63.16.250.105].60797 for sylvan.com
May  4 08:43:57 satyr named[1449]: unapproved update from [63.16.250.105].60811 for sylvan.com

-- 
Kayvan A. Sylvan                   | Proud husband of      | Father to my kids:
Sylvan Associates, Inc.            | Laura Isabella Sylvan | Katherine Yelena
http://www.successlinks.com/kayvan | Reach your goals now! | Robin Gregory