CIDR working

amechi_xl · ‎10-03-2007

How does supernetting work.For e.g, 115.64.4.0/22 has been assigned.what add can be assinged as hosts.

Kevin Dorrell · ‎10-03-2007

That is not really supernetting - 115.64.4.0/22 is a normal subnet of the old Class A network 115.0.0.0/8.

For 115.64.4.0/22, a valid host address is anything from 115.64.4.1 to 115.64.7.254, a total of 1021 addresses. But normally you would break this range up into smaller chunks.

Kevin Dorrell

Luxembourg

paul.matthews · ‎10-03-2007

Er, I am not sure how the question fits in with CIDR and supernetting.

The basic quesion about 115.64.4.0/22 - well /22 gives 252 in the third octet - that gives networks of 0,4,8 etc, so this address block is 115.64.4.0-7.255. 7.255 is broacast if you use it all as a single network, and zero is the network ID, si 115.64.4.1-7.254 are available.

I suspect that is not what you are asking. CIDR is basically forget about class A/B/C etc, you need to know the mask to know about a network. Supernetting is very similar to summarisation.