$ sudo ip6tables -I INPUT -s ::ffff:211.161.19 -j DROP
ip6tables v1.3.6: host/network `::ffff:211.161.19' not found
Try `ip6tables -h' or 'ip6tables --help' for more information.

$  sudo ip6tables --table filter --append INPUT -s ::ffff:211.161.19 -j DROP
ip6tables v1.3.6: host/network `::ffff:211.161.19' not found
Try `ip6tables -h' or 'ip6tables --help' for more information.

$ sudo ip6tables -A INPUT -s ::ffff:211.161.19/128 -j DROP
ip6tables v1.3.6: host/network `::ffff:211.161.19' not found
Try `ip6tables -h' or 'ip6tables --help' for more information.

$ host ::ffff:211.161.19 ::ffff:211.161.19 has address 64.158.56.56
::ffff:211.161.19 has address 206.112.100.132
Host ::ffff:211.161.19 not found: 3(NXDOMAIN)
Host ::ffff:211.161.19 not found: 3(NXDOMAIN)