my $count = 0;

for ( values %default )  # don't really need to know the keys
{
   $count++;
   my $total_c = substr( $_, rindex( $_, '|' )+1 );

# assume that "group" is an array of hashes:

   my $groupid = 0;
   for my $limit ( 750, 1000, 2000, 5000, 10000 ) {
      if ( $total_c < $limit ) {
         last;
      } else {
         $groupid++;
      }
   }

   $group[$groupid]{$count} = $_;
}