It sounds like you want Net::Whois. Here's an example that retrieves the contacts listed with the WHOIS server.

#! /usr/bin/perl

use strict ;
use warnings ;

use Net::Whois ;

my $domain = shift @ARGV or die "I need a domain to check!" ;

my $w = new Net::Whois::Domain $domain
  or die "Can't connect to Whois server\n" ;

unless ($w->ok) { die "No match for $domain" }
if ( my $contact_hashref = $w->contacts )
{
    foreach my $contact ( keys %$contact_hashref )
    {
        print join "\n\t", $contact, @{$contact_hashref->{$contact}} ;
        print "\n\n" ;
    }
}
[download]

And here's the program in action:

$ perl test.pl example.com  
ADMINISTRATIVE
        Internet Assigned Numbers Authority  (IANA)             iana@I
+ANA.ORG
        4676 Admiralty Way, Suite 330
        Marina del Rey, CA 90292
        US
        310-823-9358
        Fax- 310-823-8649

TECHNICAL
        Internet Assigned Numbers Authority  (IANA)             iana@I
+ANA.ORG
        4676 Admiralty Way, Suite 330
        Marina del Rey, CA 90292
        US
        310-823-9358
        Fax- 310-823-8649
[download]

Hope that helps.