Perhaps this will help:

#!/usr/bin/perl
use warnings;
use strict;

use Inline::Files;

my %ranges;
while ( <RANGE> ) {
    next unless /\S/;
    my ( $key, $start, $end ) = split;
    push @{ $ranges{ $key } }, [ $start, $end ];
    }

while ( <CODE> ) {
    next unless /\S/;
    my ( $key, $code ) = split;
    if ( exists $ranges{ $key } && grep $code >= $_->[ 0 ] && $code <=
+ $_->[ 1 ], @{ $ranges{ $key } } ) {
        print;
        }
    }

__RANGE__
T2 23 43 
T2 45 78 
Tn 66 124 
__CODE__
T2 34 lit
T3 20 mir
Tn 100 net2
Tk 1234 low3
[download]

Produces the result:

T2 34 lit
Tn 100 net2
[download]