Talk:CIDR notation

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The contents of the CIDR notation page were merged into Classless Inter-Domain Routing on 2013-03-01 and it now redirects there. For the contribution history and old versions of the merged article please see its history.

I will sometimes see trailing 0s omitted when CIDR notation is used to describe networks (as opposed to hosts) e.g. 192.168/22 instead of 192.168.0.0/22. Where does this come from? Is it accepted practice? Should it be mentioned in the article? — Preceding unsigned comment added by Kvng (talk • contribs) 12:49, October 8, 2010 (UTC)

In my opinion it's not good practice, since I'm pretty sure that most routers wouldn't take it for input.--Jasper Deng (talk) 23:29, 25 April 2012 (UTC)[reply]

I have seen people using any address, not just the beginning of the subnet, before the /; interchangeably with .0 or .whatever is the beginning I doubt there is much dispute that 192.168.0.0/24 is valid. But is 192.168.0.42/24? And if so, does it specify the same range of IPs? Or does it specify 192.168.0.42 through 192.168.1.42 or just thru .255? —Preceding unsigned comment added by 68.70.81.66 (talk) 21:10, 10 November 2010 (UTC)[reply]

192.168.0.0/24 and 192.168.0.42/24 refer to the same network. The /24 indicates the first 24 bits (three octets) are used to indicate network address and the last eight bits indicate host address. The 192.168.0.42/24 approach would be most commonly used to indicate the subnet mask to be applied to the 192.168.0.42 address, 255.255.255.0 in this case. -- Dave Braunschweig (talk) 04:15, 4 December 2012 (UTC)[reply]

The article fails to explain what "prefix" means. It also brings in the subnet mask without expaining the association. This needs to be fixed in the first part of it. - KitchM (talk) 19:19, 16 October 2011 (UTC)[reply]