I think this what you are looking for:

use strict;
use warnings;

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

       my ($b_real_ip,$b_ip, $temp, $e_ip) = $ip_range =~ m#(\d+\.\d+\
+.\d+\.)(\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,$server,$b_real_ip) } = \@ip_g;
}

for my $key (sort keys %HoA)
{
    
    for my $key2 (@{  $HoA{ $key }  })
    {
        print "$key\t";    
        print "$key2\n";
    }
    print "\n";
}
__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
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