new hosts appearing between 2013-07-02_0800 and 2013-07-03_0800:
flashgames.ru                   has IPv4 has IPv6 2001:4c08:2005::2 (ok) (time=0.147525), 2001:4c08:2005::3 (ok) (time=0.149135), 2001:4c08:2005::4 (ok) (time=0.148258), 2001:4c08:2005::5 (ok) (time=0.147453), 2001:4c08:2005::6 (ok) (time=0.147752), 2001:4c08:2005::1 (ok) (time=0.149726)
www.nist.gov                    has IPv4 has IPv6 2610:20:6b01:4::204 (ok) (time=0.092229)

hosts disappearing between 2013-07-02_0800 and 2013-07-03_0800:
mail.ru                         had IPv4 had IPv6 2a00:1148:1:1322::b0ba  
www.narkive.com                 had IPv4 had IPv6 2001:41d0:2:13b5::1  
www.psychologytoday.com         had IPv4 had IPv6 2607:400:0:1f3::1:49  
www.socialsecurity.gov          had IPv4 had IPv6 2001:1930:e03::aaaa (failed) (errno=60) 
www.ssa.gov                     had IPv4 had IPv6 2001:1930:c01::aaaa