LDAP searching

I have here a OSX 10.5.6 Mini which connects to a Linux openldap server to get user authentication stuff. How can I see if i certain group (or cn inside a ou) exists when I cannot see it in the Directory Utility? So, first I want to see if the Mac sees it. And then, how can I persuade the Directory Ulitity to see it?

If this was linux, getent would answer my question. unfortunately I do not know the OSX equivalent to it.