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IP CIDR Addressing Example
(Page 2 of 4)
First Level of Division
The pie is initially
cut down the middle by using the single left-most host ID bit as an
extra network bit. Let's see our network address block, 18.104.22.168/15
in binary, with the left-most host ID bit shown highlighted:
To make the split, we make one network
equal to this binary network address with the highlighted bit remaining
zero, and the other one with it changed to a one. This creates two subnetworksnot
subnets as in the classful sense of the word, but portions
of the original networkwhich I have numbered based on the numeric
value of what is substituted into the new network ID bits:
Subnetwork #0: 01000111
Subnetwork #1: 01000111
Since bit #16 is now also part of
the network address, these are /16 networks, the size of
a classful Class B network. So, the subnetworks are:
Subnetwork #0: 22.214.171.124/16
Subnetwork #1: 126.96.36.199/16
Youll notice that the #0
subnetwork has the same IP address as the larger network it came from;
this is always true of the subnetwork 0 in a network.
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The TCP/IP Guide (http://www.TCPIPGuide.com)
Version 3.0 - Version Date: September 20, 2005
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