Last login from IPv6 is displayed incorrectly:
When you click on it you've got:
"Cannot access utmp:ffff:62.21.44.x:::\$__desc "
Login history is now displayed badly too:
client-fhukamil3 ::ffff:31.175.207.53 2015/05/13 12:17:59 2015/05/13 12:21:42 Logout
client-stanislawbil ::ffff:78.9.147.11 2015/05/12 20:17:03 2015/05/13 02:12:14 Session Expired
client-stanislawbil ::ffff:78.9.147.11 2015/05/12 13:49:11 2015/05/13 00:55:47 Session Expired
client-ddamianek7 ::ffff:31.0.1.116 2015/05/12 13:33:41 2015/05/12 13:34:34 Logout