http://www.rfc-editor.org/rfc/rfc2770.txt
RFC 2770: GLOP Addressing in 233/8, D. Meyer, P. Lothberg2000-02-01T23:00:00-00:00This describes an experimental policy for use of the class D address space using 233/8 as the experimental statically assigned subset of the class D address space. This memo defines an Experimental Protocol for the Internet community.