鬱だ氏ね！コードレッド(Code Red)

XXXXXXXXXやNNNNNNNNNのCodeRedアクセスが
落ち着いたカナと思ったら今度は

203.246.81.170 - - [14/Aug/2001:05:42:19 +0900] "-" 408 -
203.239.134.29 - - [14/Aug/2001:06:10:24 +0900] "-" 408 -
203.67.241.128 - - [14/Aug/2001:06:38:14 +0900] "-" 408 -
203.248.129.50 - - [14/Aug/2001:06:56:09 +0900] "-" 408 -
203.73.165.36 - - [14/Aug/2001:07:08:03 +0900] "-" 408 -
203.144.224.240 - - [14/Aug/2001:07:10:54 +0900] "-" 408 -
203.241.197.125 - - [14/Aug/2001:07:44:04 +0900] "-" 408 -
203.239.58.193 - - [14/Aug/2001:10:17:01 +0900] "-" 408 -
203.224.27.176 - - [14/Aug/2001:10:19:56 +0900] "-" 408 -
203.227.37.239 - - [14/Aug/2001:10:21:53 +0900] "-" 408 -

なんですけど、これって何？