You can also use DBI and DBD::ADO to query your Active Directory, to get all objects you could use "(objectCategory=*)" as filter.

#!perl
use strict;
use warnings;

use Win32::OLE;
use DBI;

# find the default naming context for the domain we are logged in
my $rootDSE = Win32::OLE->GetObject("LDAP://rootDSE")->Get("defaultNam
+ingContext")
        or die "could not get rootDSE";
print "rootDSE is $rootDSE\n";

# Open ADO connection to AD under current logged in user
my $dbh = DBI->connect("DBI:ADO:Provider=ADSDSOObject") or die $DBI::e
+rrstr;

# We're looking for all user objects below the "test" OU
my $query = "<LDAP://OU=test,${rootDSE}>;"
                    
                    # the search filter
                    . "(objectCategory=user);"
                    
                    # You can use more criteria to filter on, e.g. 
                    # the following would only get user with a name st
+arting with A
                    #. "(&(objectCategory=user)(Name=A*));" 
                            
                    # what properties we want
                    . "Name,SAMAccountName;"
                    
                    # how deep we want to query, Subtree means we're i
+nterested about
                    # the content of all OU's below our start
                    . "Subtree";


# prepare and exec our query
my $sth = $dbh->prepare($query) or die $dbh->errstr;
$sth->execute();

my @res;
while ( my $rec = $sth->fetchrow_hashref() ) {
        print "$rec->{Name}: $rec->{SAMAccountName}\n";
}

$sth->finish();
$dbh->disconnect();
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