10. IANA Considerations

   The ICMP Extension Object header contains two 8-bit fields: The
   Class-Num identifies the object class, and the C-Type identifies the
   class sub-type.  Sub-type values are defined relative to a specific
   object class value, and are defined per class.

   IANA has established a registry of ICMP extension objects classes and
   class sub-types.  There are no values assigned within this document
   to maintain.  Object classes 0xF7 - 0xFF are reserved for private
   use.  Object class values are assignable on a first-come-first-serve
   basis.  The policy for assigning sub-type values should be defined in
   the document defining new class values.