my @range_destination
    = ( [  1.0,   1.4,   1 ],
        [  1.4,   1.9,   2 ],
        ...
        [ 99.2,  99.8,  99 ],
        [100.1, 100.9, 100 ],
       );

# what you call $val is really a KEY,
# but I'll keep your name anyway.
while ( my ( $val, $real_val ) = each %netHash ) {
  CONDITION:
    foreach my $cond_ref ( @range_destination ) {
        my ( $min, $max, $dest ) = @$cond_ref;
        if ( $val > $min && $val < $max ) {
            $capVal_Hash{$dest}{$val} = $real_val;
            last CONDITION;
        }
    }
}