>> hhh:ppp
host hhh port ppp
>> hhh:
host hhh port default-service
>> hhh
host hhh port default-service
>> [hhh]:ppp
host hhh port ppp
>> [hhh]:
host hhh port default-service
>> [hhh]
host hhh port default-service
>> #[hhh:ppp]
>> #[hhh:]
>> hhh:1pp
unknown: warning: garbage after numerical service in hhh:1pp
>> [hh.]
unknown: warning: valid hostname or network address required in [hh.]
>> hh.
unknown: warning: valid hostname or network address required in hh.
>> 999
unknown: warning: valid hostname or network address required in 999
