http://www.rfc-editor.org/rfc/rfc6319.txt
RFC 6319: Issues Associated with Designating Additional Private IPv4 Address Space, M. Azinger, L. Vegoda2011-07-01T23:00:00-00:00While this informational document does not make a recommendation for action, it documents the issues surrounding the various options that have been considered. This document is not an Internet Standards Track specification; it is published for informational purposes.