What do you need it for? Just letting Net::LDAP->add() deal w/it automatically isn't sufficient? I don't see anything specific in Net::LDAP that does it, so your approach (find all & sort & pop) seems like the way to go. Just two comments:

• It could probably be more efficient if the filter was ">= X" (see Net::LDAP::Filter for proper inequality syntax) where X was some known, high uidNumber -- basically keeping the search results to as small a set as possible.
  
• some TMTOWTDI tweaks:

  sub high_id {
    my $ldap = shift;
    my $uids = $ldap->search( ... ) or return;
    return unless $uids->count;
    my @uids = sort { $a <=> $b } map { $uid->get_value('uidNumber') } $
  +uids->all_entries;
    return $uids[-1] + 1;
  }
  [download]

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