Remember IP address Classs, Private Address Space and Default Subnet Masks

I always mention to memorize IP address Classes, Private Address Space and Default Subnet Masks. You must have to remember them. Without remembering them it's quite harder to find out the answers related to IP addressing and subnetting. I think you are already familiar the necessity of learning IP addressing and subnetting. Any CCNA exam or job exam or interview exam, must set some of the questions. So, I'm telling you seriously, to be the boss of IP addressing and subnetting, you must have to remember the class of IP addresses, private address space and default subnet masks. These are never changing. So, memorize them. This page only contains IP address classes, private address space and default subnet masks. The only things you need to remember is mentioned this page.

[Note: Visit Subnetting Index or type http://hubpages.com/hub/Subnet to your browser address bar to learn a-to-z of subnetting. Many examples are there to make you a smart master of subnetting.]

IP Address Classes

Each IP address has 32 bits (in IPv4). These 32 bits are divided into 4 blocks. Each block is separated by a dot (.). IP address can be classified into five classes. They are defined as Class A, Class B, Class C, Class D and Class E. Remember the following chart:

Class Name     Range
---------------------
Class A          1-127
Class B        128-191
Class C        192-223
Class D        224-239
Class E        240-255

Note:

  • Class D is reserved for multicast purposes.
  • Class E addresses are reserved for experimental purpose only or for future research purposes.

Private Address Space

The following private address space you need to remember:

Class Name     Address Space Range
-------------------------------------------------
Class A        10.0.0.0      to    10.255.255.255
Class B        172.16.0.0    to    172.31.255.255
Class C        192.168.0.0   to    192.168.255.255

Default Subnet Mask

The following default subnet mask you need to remember:

Class Name     Default Subnet Masks
---------------------------------
Class A        255.0.0.0
Class B        255.255.0.0
Class C        255.255.255.0

Please memorize the above IP address classes and their ranges, Private IP address space and Default subnet masks. They are very necessary when you will do subnetting and address calculating. So, memorize them all.

© Written by rancidTaste

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Comments 3 comments

Binish Baby 5 years ago

thanks


mallikarjuna 4 years ago

class a subnet masks how to use


oshinkoya babatunde 4 years ago

pls, i want to know why ip addresses are grouped into five classes. what is the significance of this

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