http://www.rfc-editor.org/rfc/rfc0922.txt
RFC 0922: Broadcasting Internet datagrams in the presence of subnets, J.C. Mogul1984-10-01T23:00:00-00:00We propose simple rules for broadcasting Internet datagrams on local networks that support broadcast, for addressing broadcasts, and for how gateways should handle them. This RFC suggests a proposed protocol for the ARPA-Internet community, and requests discussion and suggestions for improvements.