hhh:ppp
hhh:
hhh
[hhh]:ppp
[hhh]:
[hhh]
#[hhh:ppp]
#[hhh:]
hhh:1pp
[hh.]
hh.
999
[::1]
[ipv6:::1]
[ipv6:127.0.0.1]
[ipv6:example.com]