Try what jaldhar suggested, but if you want to learn how to use thread, check out the attached code, which is a multi-thread version of your code. 
use strict;
use warning;
      
use Net::DNS;
use threads;

sub resolve {
    my $res = Net::DNS::Resolver>new; 
    $res->nameservers();      
    my ($nameserver, $url) = @_;
    my $query = $res->search($url);                        
    $res->print;
    my $result;
    if ($query) { 
        foreach my $rr ($query>answer)  
           next unless $rr->type eq "A";
           $result = $rr->address;
        }
    }    
    return [$url, $result];
}

my $nameserver = "12.104.122.2";
my @url = ("www.perlmonks.com", "www.foxnews.com");
my @thread_pool;
foreach my $url @url {
    push @thread_pool, threads->new(\&resolve, $nameserver, $url);
}
my @result;
foreach my $thread @thread_pool {
    push @result, $thread->join;
}

[download]

In reply to Re: How to do multiple dns queries ? by pg
in thread How to do multiple dns queries ? by gnangia

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.