Strange accesslog

Several people access my site and IP address are all different area.
But the accesslog shows the same as below.
What does that mean? Does anyone explain what they are doing?

IPaddress - - [10/Sep/2002:03:24:54 -0700] "GET /default.ida?NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN%HTTP/1.0" 400 320 "-" "-"

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Edited to prevent access.

 

 

 

 

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