new hosts appearing between 2011-08-21_0500 and 2011-08-21_1000:
toolserver.org
www.chatvibes.com
www.siol.net
www.sprint.com
www.uni-muenchen.de
www.uv.es

hosts disappearing between 2011-08-21_0500 and 2011-08-21_1000:
www.udg.mx