As of May 4, 2016, I am aware of the following Hotline
trackers which are still up and running. Some may share the
same IP address, and they may not all be running at the same
time:

badmoon.biz
hltracker.com
hotline.boffomac.com
nederland.serverthuis.nl
pltracker.dyndns.org
tracked.agent79.org
tracked.nailbat.com
tracked.preterhuman.net
tracked.stickytack.com