RFC 1918, previously RFC1597. http://globecom.net/ietf/rfc/rfc1918.shtml or ftp://ftp.ds.internic.net:/rfc/rfc1918.txt Here is an excerpt from section 3: 10.0.0.0 - 10.255.255.255 (10/8 prefix) 172.16.0.0 - 172.31.255.255 (172.16/12 prefix) 192.168.0.0 - 192.168.255.255 (192.168/16 prefix) -a ] ] ] 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 need to know all of the numbers, i.e. I believe 10.0.0.0 is the class A ] component of the list. ] ] Thanks in advance. ] ] ] Geoff White ] Virtual Sites ] ]