Yes.  We have an IANA assigned PEN for Apache and a branch specifically for directory.  See here:
 
http://cwiki.apache.org/DIRxPMGT/oid-assignment-scheme.html
 
Alex

 
On 4/3/07, Ole Ersoy <ole.ersoy@gmail.com> wrote:
When creating a Syntax entry first create
a unique name and a unique OID.  Creating
a globally unqiue OID requires
a Private Enterprise Number (PEN), which can be
obtained from IANA.  The PEN is then prefixed to
another integer (or combination of integers separated
by periods), and the combination of the two
make a globally unique identifier for the Syntax entry.