Saturday 19 October 2013

All about IP Address

What is an IP Address?
  An Internet Protocol address is a numerical label assigned to each device (e.g., computer, mobile phone) that is connected to a computer network that uses the Internet Protocol for communication.

  An IP address is used for two purposes:
1) To identify whether the interface is host or network.
2) To determine the location of the device.

  IP Versions: IPv4 and IPv6.
Although IPv4 is the earlier version, it is the most commonly used version.

  IPv4 is a 32-bit decimal number while IPv6 is 128-bit number.

  IPv4 is normally written as four numbers between 1 and 255, each separated from the other by a decimal point.
This standard is called as DOTTED-DECIMAL NOTATION.

  Ex: 215.231.46.94

  There are countless IP addresses in today's world!

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What is the purpose of IP Address Classes?

Each IP Address Class provides the following information:

  Class A: First 8 bits → NETWORK ID & remaining 24 bits → HOST ID

  Class B: First 16 bits → NETWORK ID & remaining 16 bits → HOST ID

  Class C: First 24 bits → NETWORK ID & remaining 8 bits → HOST ID

  Class D: It represents a 32-bit multicast group ID.

  Class E: It is currently not being used. (NO need)

  For example,
Let us consider the IP Address 203.43.21.12
We know that it belongs to Class C.
Therefore, the NETWORK ID is 203.43.21 and the HOST ID is 12