What's going on with these log entries?

Hi speed UA switching . . .

[PoolDoc]

Can someone tell me what's going on with these log entries? I've got others from the same IP showing Teleport Pro and a Java string as the UA.

Note how close the times are between UA switches:

12.72.145.57 - - [28/Mar/2002:02:46:44 -0500] "GET / HTTP/1.0" 200 4224 "-" "Mozilla/4.03 [en] (Win95; I)"
12.72.145.57 - - [28/Mar/2002:02:46:44 -0500] "GET / HTTP/1.0" 200 4224 "-" "Mozilla/4.03 [en] (Win95; I)"
12.72.145.57 - - [28/Mar/2002:02:46:44 -0500] "GET / HTTP/1.0" 200 4224 "-" "Mozilla/3.0C-KIT (Win16; I)"
12.72.145.57 - - [28/Mar/2002:02:46:47 -0500] "GET / HTTP/1.0" 200 4224 "-" "Mozilla/4.03 [en] (Win95; I)"
12.72.145.57 - - [28/Mar/2002:02:46:48 -0500] "GET / HTTP/1.0" 200 4224 "-" "Mozilla/3.0 (Win16; I)"

[wilderness]

Whats going on is somebody is taking your webpages very fast and your paying for it :-(

http://www.tenmax.com/teleport/pro/home.htm

you need to set up your htaccess to deny both
12.72.145.
and
Teleport Pro