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Subnetting Examples

Subnetting is a fundamental concept in networking that involves dividing an IP network into sub-networks or subnets. This process allows for efficient utilization of IP addresses and better network management. In this guide, we’ll explore subnetting examples to provide a clear understanding of how it works.

What is Subnetting?

Subnetting is like creating smaller neighborhoods within a large city. In networking, it involves dividing a range of IP addresses into smaller, more manageable segments. This helps in organizing and securing the network efficiently.

Basics of Subnetting

Let’s consider a simple example using decimal representation:

In binary representation, this division would occur by breaking addresses into powers of 2. For instance, the binary form of the first few addresses reveals clear subnets: 01100 and 01101.


Decimal

Binary

Subnet

100

01100100

01100 100

101

01100101

01100 101

102

01100110

01100 110

103

01100111

01100 111

104

01101000

01101 000

To identify the boundary of a network, a subnet mask is used. In the example, the subnet mask would be 11111000 in binary, equivalent to 248 in decimal.

Full-Length IP Address Examples

Extending this principle to full-length IP addresses involves longer addresses and masks. Consider IP addresses 193.62.83.10 and 193.62.83.108 with a subnet mask of 255.255.255.224:

The mask, in this case, has 27 ones, and an alternative representation is to append the ‘prefix length’ to the IP address, like this: 193.62.83.10/27.

Subnetting at Anycollege

Let’s delve into a practical example at Anycollege:


Name

Start Position

Subnet Mask

Max Size (Power of 2)

Host IP Address Range

Faculties

0.0.0.0

255.255.255.128

128

193.62.83.1 – 193.62.83.126

Administration

0.0.0.128

255.255.255.224

32

193.62.83.129 – 193.62.83.158

Computing

0.0.0.160

255.255.255.224

32

193.62.83.161 – 193.62.83.191

Decoding IP Addresses

Understanding how IP addresses fit into subnets is crucial. For instance, an IP address of 193.62.83.135 in the subnet 255.255.255.224 is part of the subnet starting at 193.62.83.128.

Conclusion

Subnetting is a powerful tool for network management, enhancing efficiency and security. These examples illustrate how subnetting works in practical scenarios. As networks grow, mastering subnetting becomes increasingly important for effective IP address management.

Evgeny Sevastyanov

Client Support Teamleader

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