Before moving on, a short review of typical IP subnetting terms and typical applications should help clarify the terms used in this book and will act as a refresher for those already versed in IP addressing.
A /24
designator placed after a network IP address in diagrams or device configurations is a Classless Inter-Domain Routing (CIDR) designator that indicates the following:
10.1.1.0
(the next /24
network would be 10.1.2.0
, then 10.1.3.0
, and so on).10.1.1.0
(typically called the loopback address)10.1.1.255
The 8 bits binary is equal to 256 decimal, minus the preceding two exceptions. This leaves 254 usable IP addresses for devices, starting with 10.1.1.1
, 10.1.1.2
, and so on up to 10.1.1.254
.
255.255.255.0
, which again indicates that the first 24 bits of an IP address is the network and the remaining 8 bits are for hosts.The following table shows the IP address ranges in the three major classes:
Class of IP address |
Starting IP address |
Ending IP address |
---|---|---|
A |
|
|
B |
|
|
C |
|
|
The following table shows the private IP address ranges:
Class of private IP addresses |
Starting IP address |
Ending IP address |
---|---|---|
A |
|
|
B |
|
|
C |
|
|
A deeper review of IP addressing and subnetting is beyond the scope of this book. If you're not familiar with these concepts, some additional study would be advisable as a solid understanding of IP subnetting is essential for most analysis activities.
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