If you have a Chef Server 12.x version and would like to find out facts about all nodes in all orgs, you can do something like the following from the server itself.
You can retrieve all the orgs on the server with
chef-server-ctl org list
You could iterate through the org list like this, replacing the SERVERNAME and iterating on the ORGNAMEs returned above
knife search node '*:*' -a id -s https://SERVERNAME/organizations/ORGNAME -u pivotal -k /etc/opscode/pivotal.pem
-a allows you to choose which search fields are returned from the search.