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Internet Protocol (IP)

Introduction to IP

IP (Internet Protocol) is a fundamental communication protocol in the Internet and local networks. It assigns a unique numerical label to each device within a network, ensuring proper data transfer and routing.

Functions of IP:

  • Identifies devices on a network.
  • Enables data packet transmission between devices.
  • Supports addressing and routing to ensure efficient communication.

Versions of IP

There are two primary versions of IP:

  1. IPv4 (Internet Protocol Version 4)
  2. IPv6 (Internet Protocol Version 6)

IPv4 Address Structure

  • IPv4 is a 32-bit addressing system.
  • It is divided into four sections (also called octets).
  • Each section consists of 8 bits.
  • Uses decimal notation, where each section ranges from 0 to 255.
  • Example of an IPv4 address: 192.168.1.1

Range of IPv4 Addresses:

  • The minimum address: 0.0.0.0
  • The maximum address: 255.255.255.255

Total Number of IPv4 Addresses:

Each IPv4 address consists of 32 bits, and since each bit has 2 possible values (0 or 1), the total number of unique IPv4 addresses is:

$$2^{32} = 4,294,967,296$$

(approximately 4.3 billion addresses)

Assignment of IPv4 Addresses (Example Sequence):

  • 0.0.0.0
  • 0.0.0.1
  • 0.0.0.2
  • 0.0.0.3
  • 0.0.0.9
  • 0.0.0.10
  • 0.0.0.255
  • 0.0.1.0
  • … (continues sequentially)

IPv6 Address Structure

  • IPv6 is a 128-bit addressing system.
  • Uses eight groups of four hexadecimal digits.
  • Example of an IPv6 address: 2001:0db8:85a3:0000:0000:8a2e:0370:7334
  • Provides a significantly larger number of addresses:
$$2^{128}$$

(approximately 340 undecillion addresses).

IP Address Classes

IPv4 addresses are categorized into five classes: A, B, C, D, and E. Each class has a specific range and purpose.

Class A

  • Range: 0.0.0.0 to 127.255.255.255
  • First bit: 0 (ON), remaining bits for network and host.
  • Network bits: 8
  • Host bits: 24
  • Purpose: Assigned to large networks, often used by government organizations.
  • Bit Representation: 0XXXXXXX.XXXXXXXX.XXXXXXXX.XXXXXXXX

Class B

  • Range: 128.0.0.0 to 191.255.255.255
  • First two bits: 10 (ON), remaining bits for network and host.
  • Network bits: 16
  • Host bits: 16
  • Purpose: Used by medium-sized businesses and universities.
  • Bit Representation: 10XXXXXX.XXXXXXXX.XXXXXXXX.XXXXXXXX

Class C

  • Range: 192.0.0.0 to 223.255.255.255
  • First three bits: 110 (ON), remaining bits for network and host.
  • Network bits: 24
  • Host bits: 8
  • Purpose: Assigned to small networks, such as local businesses and private organizations.
  • Bit Representation: 110XXXXX.XXXXXXXX.XXXXXXXX.XXXXXXXX

Class D

  • Range: 224.0.0.0 to 239.255.255.255
  • First four bits: 1110 (ON), used for multicast groups.
  • Purpose: Reserved for multicast networking.
  • Bit Representation: 1110XXXX.XXXXXXXX.XXXXXXXX.XXXXXXXX

Class E

  • Range: 240.0.0.0 to 255.255.255.255
  • First four bits: 1111 (ON), used for experimental purposes.
  • Purpose: Reserved for research and development.
  • Bit Representation: `1111XXXX.XXXXXXXX.XXXXXXXX.XXXXXXXX