port scan from 53

["JKruser" <jkruser () adelphia net>]

Does anyone have any idea what would cause a scan to originate from port 53
on an IRIX based server and destined for users on incrementing ports
starting in the 1000 range and continuing, in cases, to 4000 range.

Here is one section of log if it helps:

2000/09/14,09:21:48 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1038,UDP
2000/09/14,09:22:06 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1042,UDP
2000/09/14,09:22:56 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1045,UDP
2000/09/14,09:23:00 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1048,UDP
2000/09/14,09:23:12 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1052,UDP
2000/09/14,09:24:04 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1054,UDP
2000/09/14,09:28:00 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1068,UDP
2000/09/14,09:28:12 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1071,UDP
2000/09/14,09:33:00 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1079,UDP
2000/09/14,09:33:14 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1082,UDP
2000/09/14,09:37:08 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1086,UDP
2000/09/14,09:38:00 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1089,UDP
2000/09/14,09:38:14 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1092,UDP
2000/09/14,09:43:00 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1099,UDP
2000/09/14,09:43:12 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1102,UDP
2000/09/14,09:48:00 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1113,UDP
2000/09/14,09:48:12 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1116,UDP
2000/09/14,09:48:42 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1119,UDP
2000/09/14,09:48:46 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1122,UDP
2000/09/14,09:48:56 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1127,UDP
2000/09/14,09:49:26 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1133,UDP
2000/09/14,09:49:30 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1135,UDP
2000/09/14,09:53:00 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1142,UDP
2000/09/14,09:53:12 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1145,UDP
2000/09/14,09:55:24 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1147,UDP
2000/09/14,09:57:08 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1149,UDP
2000/09/14,09:57:10 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1152,UDP
2000/09/14,09:57:54 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1158,UDP
2000/09/14,09:58:00 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1160,UDP
2000/09/14,09:58:02 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1162,UDP
2000/09/14,09:58:16 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1166,UDP
2000/09/14,09:58:24 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1168,UDP
2000/09/14,09:58:26 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1169,UDP
2000/09/14,09:58:26 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1170,UDP
2000/09/14,09:58:34 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1171,UDP
2000/09/14,09:58:36 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1172,UDP
2000/09/14,09:58:36 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1173,UDP
2000/09/14,09:58:40 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1174,UDP
2000/09/14,09:58:40 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1175,UDP
2000/09/14,09:58:42 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1176,UDP
2000/09/14,09:58:48 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1177,UDP
2000/09/14,09:58:50 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1178,UDP
2000/09/14,09:58:52 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1179,UDP
2000/09/14,09:59:00 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1180,UDP
2000/09/14,09:59:00 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1182,UDP
2000/09/14,09:59:00 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1183,UDP
2000/09/14,09:59:10 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1186,UDP
2000/09/14,10:00:44 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1192,UDP
2000/09/14,10:00:46 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1194,UDP
2000/09/14,10:00:48 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1196,UDP
2000/09/14,10:02:04 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1204,UDP
2000/09/14,10:03:02 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1214,UDP
2000/09/14,10:03:14 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1217,UDP
2000/09/14,10:05:12 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1227,UDP
2000/09/14,10:05:30 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1229,UDP
2000/09/14,10:07:48 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1231,UDP
2000/09/14,10:08:04 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1235,UDP
2000/09/14,10:08:06 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1237,UDP
2000/09/14,10:08:20 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1242,UDP
2000/09/14,10:13:04 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1245,UDP
2000/09/14,10:13:18 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1248,UDP
2000/09/14,10:18:06 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1251,UDP
2000/09/14,10:18:18 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1254,UDP
2000/09/14,10:23:00 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1257,UDP
2000/09/14,10:23:12 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1260,UDP
2000/09/14,10:28:00 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1263,UDP
2000/09/14,10:28:12 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1266,UDP
2000/09/14,10:33:02 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1269,UDP
2000/09/14,10:33:14 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1272,UDP
2000/09/14,10:35:52 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1274,UDP
2000/09/14,10:38:00 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1278,UDP
2000/09/14,10:38:14 -5:00 GMT,
Server.IP.Address:53,Client.IP.Address:1281,UDP

Thanks for the assistance.

JK