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Today we learn What Are private and Public IP....!!! its so easy and simple things which is given below with possible details
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What are Private and Public IP Addresses
Internet Protocol (IP) addresses are usually of two types:
Public and Private.
If you have ever wondered to know what is the difference between a
public and a private IP address, then you are at the right place. In
this post I will try to explain the difference between a public and a
private IP addres in layman’s terms so that it becomes simple and easy
to understand
.
What are Public IP Addresses?
A public IP address is assigned to every computer that connects to
the Internet where each IP is unique. Hence there cannot exist two
computers with the same public IP address all over the Internet.
This addressing scheme makes it possible for the computers to “find each
other” online and exchange information. User has no control over the IP
address (public) that is assigned to the computer. The public IP
address is assigned to the computer by the Internet Service Provider as
soon as the computer is connected to the Internet gateway.A public IP
address can be either
static or
dynamic.
A static public IP address does not change and is used primarily for
hosting webpages or services on the Internet. On the other hand a
dynamic public IP address is chosen from a pool of available addresses
and changes each time one connects to the Internet. Most Internet users
will only have a dynamic IP assigned to their computer which goes off
when the computer is disconnected from the Internet. Thus when it is
re-connected it gets a new IP.You can check your public IP address by
visiting
www.whatismyip.com.
What are Private IP Addresses?
An IP address is considered private if the IP number falls within one
of the IP address ranges reserved for private networks such as a Local
Area Network (LAN). The Internet Assigned Numbers Authority (IANA) has
reserved the following three blocks of the IP address space for
private networks (local networks):
10.0.0.0 – 10.255.255.255 (Total Addresses: 16,777,216)
172.16.0.0 – 172.31.255.255 (Total Addresses: 1,048,576)
192.168.0.0 – 192.168.255.255 (Total Addresses: 65,536)
Private IP addresses are used for numbering the computers in a
private network including home, school and business LANs in airports and
hotels which makes it possible for the computers in the network to
communicate with each other. Say for example, if a
network X consists of 10 computers each of them can be given an IP starting from
192.168.1.1 to
192.168.1.10. Unlike
the public IP, the administrator of the private network is free to
assign an IP address of his own choice (provided the IP number falls in
the private IP address range as mentioned above).
Devices with private IP addresses cannot connect directly to the
Internet. Likewise, computers outside the local network cannot connect
directly to a device with a private IP. It is possible to interconnect
two private networks with the help of a router or a similar device that
supports Network Address Translation.
.
If the private network is connected to the Internet (through an
Internet connection via ISP) then each computer will have a private IP
as well as a public IP. Private IP is used for communication within the
network where as the public IP is used for communication over the
Internet. Most Internet users with a DSL/ADSL connection will have both a
private as well as a public IP. You can know your private IP by typing
ipconfig command
in the command prompt. The number that you see against “IPV4 Address:”
is your private IP which in most cases will be 192.168.1.1 or
192.168.1.2. Unlike the public IP, private IP addresses are always
static in nature.Unlike what most people assume, a private IP is neither
the one which is impossible to trace (just like the private telephone
number) nor the one reserved for stealth Internet usage. In reality
there is no public IP address that is impossible to trace since the
protocol itself is designed for transperancy.
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