On Wed, Feb 09, 2005 at 08:30:19AM -0800, Vishwas Manral wrote: > I do not know who stated this: - > > "256 /24 nets; 192.168.x.x > 16 /16 nets; 172.16.x.x through 172.31.x.x > 1 /8 net; 10.x.x.x " I'm guilty. :) > But the above is wrong. The correct values are: - > > The Internet Assigned Numbers Authority (IANA) has reserved the > following three blocks of the IP address space for private > internets: > > 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) We're both right, the numbers are the same, but RFC 1918 quoted above uses the CIDR notation, while I stuck to the traditional class sizes. (Which admittedly is really old and out of fashion.) The paragraph following the quote also contains; "Note that (in pre-CIDR notation) the first block is nothing but a single class A network number, while the second block is a set of 16 contiguous class B network numbers, and third block is a set of 256 contiguous class C network numbers." Of course, since they are private, they can be divided any way desired. Regards, //Peter
