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Part 24- IP address ( Introduction and types part 2) - Computer Networking- CCNA





Hello friends my name is Vasu Birla and today will discuss third method or idea on which we can divide IP address types. So Let’s start … in previous part we have discussed two methods already  now third method is here 

3. Public and Private IP address 

 Public IP address -   When Classful addresses were introduced , IANA  made available IP address of three classes A B and C  for public 

Means these IP addresses  -  Class A  begins 1 to 126  for government  or very big organizations 

                                             Class B begins 128 to 191  available  for medium size companies 

                                             Class C  begins 192 to 223 available for small organization 

And with this basic idea IANA started assignments of IP addresses. Means  those people who wanted to connect with public network or Internet they had to assign IP address among these public IP adds ranges and for that they had to pay IANA, but  these IP adds were not distributed directly by IANA to users , IANA provides These Public IP ranges to Service provider and  Servicer providers distribute these IPs to organizations or to particular users.

Private IP address -   But here IANA defines one more concept of private IP addresses for those people who don’t want to pay for network and  don’t want to connect with public network or Internet Although  users can assign any kind of IP adds in private network but whenever they want to make their private network to public they can not do it because they did not paid for such public IP adds 
That is why IANA  provides some special ranges from each class  for private networks and these ranges are free of cost.  Private IP address are not routable.

Ranges of Private IP address -     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

So above given private IP address ranges are free of cost you don’t have to pay with these ip addresses  and you can assign IP address to your private network hosts.
But if you wants to connect your private Network to internet so you have to use some translation methods like  NAT (Network Address Translation)  we will discuss about it later.




Thanks for reading  in the next part we will discuss about some special kind of addresses  you will get very deeply and sharp knowledge about IP address......  good luck     Hare krishna.

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