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Classless Inter-Domain Routing
. Similar to a subnet mask, changing that number 
results in a different number of IP addresses. For example, if you change the 
/24
 
portion of the network to 
/22
, you instantly have 1,022 possible addresses to work 
with, rather than 254. If you lower it again to 
/20
, the number jumps to 4,094. For 
now, don't worry too much about this. You can focus on remembering that the 
higher the number, the fewer IP addresses you have. It can go up to 
/32
, which 
only gives you one IP address. If you'd like to experiment further with subnetting, 
we've provided a subnet calculator in the 
Further reading
 section.
Of course, no single IP address scheme is right for everyone. The one I provided 
is simply a hypothetical example, so you shouldn't copy mine and use it on your 
network unless it matches your needs. I'll use this scheme for the remainder of 
this chapter, since it works fine as an example. To explain my sample rollout, we 
start off with a 24-bit network, 
192.168.1.0/24
. The address 
192.168.1.0
 refers to 
the network itself, and that IP address is not assignable to clients. The first usable 
IP address in this subnet will be 
192.168.1.1
. The last IP address in this block 
(
192.168.1.255
) is not assignable either, since that is known as the