2001-0db8-1234-5678 0000-0000-0000-0005
2001:db8::1
2001:db8::12
2001:db8::123
2001:db8::1234
2001:db8::1234:5
2001:db8::1234:56
2001:db8::1234:567
2001:db8::1234:5678
2001:db8::1234:5678:9
2001:db8::1234:5678:9a
2001:db8::1234:5678:9ab
2001:db8::1234:5678:9abc
2001:db8::1234:5678:9abc:d
2001:db8::1234:5678:9abc:de
2001:db8::1234:5678:9abc:def
2001:db8::1234:5678:9abc:deff
::1
2001:0db8:1234:5678::5
2001_db812345678__00__00__00__05
2001:DB8:1234:5678::5
1:2::3::4:5
12345:6789::1
1:2::3:4:5:6:7:8
