What is Private IP? Give an example?

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Three blocks of IP addresses are reserved for private use and are not routed over the Internet. Companies can assign these addresses to nodes on their private LANs at any time without conflict.


EXAMPLE:::

                                                              CIDR
From              To                                    Representation
10.0.0.0         10.255.255.255               10/8
172.16.0.0     172.31.255.255               172.16/12
192.168.0.0   192.168.255.255             192.168/16

giri_adepu

  • Jun 2nd, 2008
 

private ip address basically used at with in the lan environment for mechine to mechine communication.it means depends up on the company with in the room .with in the floor or with in the building

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the address which can't be routed through public (internet) are private ip addresses
and it is scheam of saving public address
ex:in class A range is10.0.0.0 to 10.255.255.255
        

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In the WAN topology, a network is divided usually by the firewall into the 'outside' or public IP addresses and the 'inside' or private IP addresses.  The is done because public IP addresses (provided by the ISP) are expensive and running out (therefore the creation of IPv6).  
The inside or private side can use virtually any IP addressing scheme but using class C is most typical in order to segment and not run out of IP addresses.  On the outside or public side, the firewall or router assigns a private IP to a public IP address for communication.  The one-to-one assignment is called NAT.  However, you can run out of outside (public) IP addresses.  Then you would use PAT or Port Address Translation so send connections out through the mutiple ports of just one IP address.

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