new hosts appearing between 2012-04-21_0800 and 2012-04-22_0800:
www.census.gov                  has IPv4 148.129.75.218 has IPv6 2610:20:2110:103::1:218 (ok)
www.ijreview.com                has IPv4 50.17.186.143 has IPv6 2406:da00:ff00::3211:ba8f (ok)
www.netregistry.com.au          has IPv4 202.124.247.2 has IPv6 2403:1400:2:1::101 (ok)
www.rcn.com                     has IPv4 207.172.156.181, 207.172.156.182 has IPv6 2610:80:0:10a:214:4fff:feea:805c (ok), 2610:80:0:10a:214:4fff:feea:8020 (ok)
www.sch.gr                      has IPv4 194.63.235.170 has IPv6 2001:648:2302:fd00:203:baff:fed2:cd07 (ok)
www.zdarma-ruleta.cz            has IPv4 77.93.211.207 has IPv6 2a01:430:1a::207 (ok)

hosts disappearing between 2012-04-21_0800 and 2012-04-22_0800:
www.gov.hk                      had IPv4 202.128.243.212 had IPv6 2406:0:6a:1::84 
www.iij4u.or.jp                 had IPv4 210.148.162.25 had IPv6 2001:240:bb81:8500::3:101 
www.packagetrackr.com           had IPv4 141.101.126.69, 141.101.125.69 had IPv6 2400:cb00:2048:1::8d65:7d45 , 2400:cb00:2048:1::8d65:7e45 
www.picaphobia.com              had IPv4 64.62.200.36 had IPv6 2001:470:1:1c7::403e:c824 
www.simplyrecipes.com           had IPv4 64.71.132.139 had IPv6 2001:470:1:1e::4047:848b 
www.zenfolio.com                had IPv4 184.105.196.161, 184.105.196.162 had IPv6 2001:470:4d:6::1 , 2001:470:4d:6::2