http://www.rfc-editor.org/rfc/rfc1918.txt
RFC 1918: Address Allocation for Private Internets, Y. Rekhter, B. Moskowitz, D. Karrenberg, G. J. de Groot, E. Lear1996-02-01T23:00:00-00:00This document describes address allocation for private internets. This document specifies an Internet Best Current Practices for the Internet Community, and requests discussion and suggestions for improvements.