new hosts appearing between 2011-05-09 and 2011-05-16:
m-cocolog.jp
www.cfos.de
www.harvard.edu
www.k12.pa.us
www.lokalisten.de
www.qwest.com
www.root.cz
www.sannet.ne.jp
www.tokyotosho.info
www.voc.com.cn

hosts disappearing between 2011-05-09 and 2011-05-16:
www.debian.org
www.menagea3.net