September 30, 2019

What Are The 4 Parts of An IP Address Mean?

Demystifying IP Address Structure: Understanding the Meaning of Its Four Sections

You might have encountered IP addresses numerous times and wondered what those numbers signify. In this article, we’ll delve into the structure of an IP address to help you understand its components.

Understanding IP Address Basics

An IP address is, therefore, a number that individual devices that are connected to the Internet in a global network use as they transfer data with the use of the Internet Protocol. Every IPv4 address is made up of a string of 32 bits which can most often be seen in the form of four numbers with periods in between. For example, let’s consider the IP address 76.240.249.145.

Binary Representation

Computers work on the base of Binary code which means they see everything in terms of either 0s and 1s. While humans look at the IP address as decimal numbers, the computers read the numbers in binary format. The decimal numbers can be converted to their binary equivalents:

• 76 in binary is 01001100
• 240 in binary is 11110000
• 249 in binary is 11111001
• 145 in binary is 10010001

So, the IP address 76.240.249.145 is represented in binary as 01001100.11110000.11111001.10010001.

The Four Parts of an IP Address

An IP address is divided into two main sections: the network ID and the host ID. These parts are crucial in defining your network and the specific device on that network.

• Network ID: Identifies the specific network.
• Host ID: Identifies the specific device on that network.

The division into network and host IDs depends on the network class, which is determined by the IP address structure.

IP Address Classes and Their Structure

IP addresses are also categorized into three classes which determine how the address is divided between the network and host IDs.

• Class A Networks
  • Structure: The first octet represents the network ID, and the remaining three octets represent the host ID.
  • Usage: Appropriate for very large networks capable of housing millions of hosts.
• Class B Networks
  • Structure: The first 2 octets are for network identification while the last 2 octets are for host identification.
  • Usage: Used for medium-sized networks with thousands of hosts.
• Class C Networks
  • Structure: The first three octets represent the network ID, and the last octet represents the host ID.
  • Usage: Ideal for smaller networks with up to 254 hosts.

This classification is an essential part of the breakdown of the IP address to make workable management of networks possible.

Subnetting: Further Dividing the Network

The third section of an IP address can represent the subnet. Subnets allow networks to be divided into smaller, more manageable segments, enhancing security and improving performance. Subnetting is an essential part of understanding IP address parts, enabling efficient utilization of address space.

Device Identification

The fourth and final section of the IP address identifies the individual device within the network or subnet. This part distinguishes one device from another, ensuring accurate data transmission between specific devices.

Understanding IPv6 Address Structure

Due to the exponential growth of internet-connected devices, IPv6 was introduced to provide a vastly larger address space. IPv6 addresses are 128 bits long and are written in hexadecimal, separated by colons. An example of an IPv6 address is 2001:0db8:85a3:0000:0000:8a2e:0370:7334.

In IPv6:

• The first 64 bits is the network prefix.
• The last 64 bits signify the interface identifier (host ID).

IPv6 is comparatively easier to structure and assign addresses than IPv4 since it does not require subnet masks.

Conclusion

Understanding the parts of an IP address is fundamental to grasping how networks function. Collectively the four parts; network class, network ID, subnet, and device ID assist in routing and directing data over the internet. Network administrators have to know the IP address structure because this knowledge will help them to create large and protected networks, which are crucial for people who live in the contemporary world.

FAQs

1. What are the four parts of an IP address?
   • The four parts are the network class, network ID, subnet, and device ID, each serving a specific purpose in identifying networks and devices.
2. How is an IP address structured?
   • An IP address is divided into four octets for binary numbers, which determine the network and host parts according to the IP address classification.
3. Why is subnetting important in IP addresses?
   • Subnetting involves the division of a network into smaller networks to suit management, security, or better utilization of the IP address.