Geoff White [SMTP:geoffw@precipice.v-site.net] writes: Now for a brief excursion into the totally mundane. Can anyone point me to the internet-draft/RFC that specifies the "reserverd networks" (i.e. the class A,B, & C [sic] network numbers that are considered "safe" (no-one should be routing them) to use as test/intranet/private IP networks? I believe you're looking for RFC 1918. Here's the header; document available at: http://ds.internic.net/rfc/rfc1918.txt ---document header--- Network Working Group Y. Rekhter Request for Comments: 1918 Cisco Systems Obsoletes: 1627, 1597 B. Moskowitz BCP: 5 Chrysler Corp. Category: Best Current Practice D. Karrenberg RIPE NCC G. J. de Groot RIPE NCC E. Lear Silicon Graphics, Inc. February 1996 Address Allocation for Private Internets Status of this Memo This document specifies an Internet Best Current Practices for the Internet Community, and requests discussion and suggestions for improvements. Distribution of this memo is unlimited. 1. Introduction For the purposes of this document, an enterprise is an entity autonomously operating a network using TCP/IP and in particular determining the addressing plan and address assignments within that network. This document describes address allocation for private internets. The allocation permits full network layer connectivity among all hosts inside an enterprise as well as among all public hosts of different enterprises. The cost of using private internet address space is the potentially costly effort to renumber hosts and networks between public and private. James R. Saker Jr. James_Saker@Intellitek.com President http://Intellitek.com Network Media Division voice: 402.333.6233 Intellitek Corporation fax: 402.333.6432