#!/usr/bin/perl
use Net::DNS::Resolver;
use Thread::Pool;

sub dnslookup {
my $res=Net::DNS::Resolver->new;

my $search = $res->search($input);

foreach $rr ($search->answer)
{
        my $type=$rr->type;
        if ($type eq "A")
        {
                $host=$rr->address;
        }
        if ($type eq "PTR")
        {
                $host=$rr->ptrdname;
        }
        if ($type eq "CNAME")
        {
                $host=$rr->cname;
        }
}

print "$host\t$input\n";
}


open (FILE, "./foo") || die "Could not open file\n";
@ip=<FILE>;
close (FILE);



foreach (@ip) {
        $input=$_;
        print $input;
        &dnslookup;
}