assigning hash key to reference of array question

[steve park]

I have a below program and I am not doing it right.
Currently, only last ip pool is going in since I am putting them w/ key to
values(so only last one shows up when I print).

How can I aggregate and assign them to server_1 so that when I print below
will show up?

server_1
10.1.1.1
10.1.1.2
10.1.1.3
10.1.1.4
10.1.1.5
192.168.1.1
192.168.1.2


while ( <DATA> ) {
       my @array_ip;
       chomp;
       my ($swit,$server,$ip_range) = split;

       my ($b_real_ip,$b_ip, $e_ip) = $ip_range =~
m#(\d+\.\d+\.\d+\.)(\d+)\-(\d+)#;
       my $b_ip_copy = $b_ip;
       my @ip_g;
       while ( $b_ip_copy <= $e_ip ) {
           my $b_ip_final = join('',$b_real_ip,$b_ip_copy);
           push @ip_g , $b_ip_final;
           ++$b_ip_copy;
       }
       $HoA{ join('_',$swit,$server) } = \@ip_g;
}


__DATA__
server    1    10.1.1.1-10.1.1.5
server    2    192.168.1.1-192.168.1.5
server    1    192.168.1.1-192.168.1.2