They're just a few IPs and hosts which are said to be "bad". I cannot confirm that nor claim removing them will make you 100% secure.
Since I'm already posting, here they are.
Code:
239.192.152.143
239.255.255.250
http://update.utorrent.com/hang.php
download.utorrent.com
update.utorrent.com
http://search.utorrent.com/search.php?q=%U&e=%U&u=1&source=%U
llsw.download3.utorrent.com
ll.download3.utorrent.com
http://update.utorrent.com/uninstall?type=%s-%U&h=%s
http://update.utorrent.com/installoffer.php
/crash.php?ver=%dU&h=%s&p=%dU&pr=%dU&s=%dU&svp=%d&ov=%d
IPs are changed an invalid one (000.000.000.000), the others are filled with null characters.
These are to bootstrap DHT, i.e. get initial nodes. I don't usually remove them.
Code:
router.bittorrent.com
router.utorrent.com
These I haven't tried removing yet. Doing so may or may not (are there any other possibilities?) break something. The ones colored red may make the installation wizard crash.
Code:
http://apps.bittorrent.com/store/store.btapp
http://apps.bittorrent.com/discoverContent/discoverContent.btapp
http://apps.bittorrent.com/utorrent-onboarding/welcome.btapp
http://yogi.apps.bittorrent.com/track/?data=%s&ip=1
http://apps.bittorrent.com
http://%s/checkupdate.php
http://%s/updatestats.php
http://%s/installstats.php
http://%s/offers/ut-en-conduit-20110330.exe
http://%s/offers/ut_conduit-20110119.bmp
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