How to Divide IP Subnet Mask on Windows

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As the Internet continues to evolve, the number of available IPv4 addresses is decreasing due to the growing number of Internet users. In this article, we will guide you through the process of dividing IP Subnet Masks to conserve IP addresses.

Dividing IP addresses into smaller subnets enhances security and efficiency for network users. Currently, there are two methods for IP subdivision: Classful and VLSM. In this article, we will instruct you on how to divide IP Subnet IPs using the Classful method.

Basic IP Knowledge

IP Address Classification

There are 5 classes: A, B, C, D, E. Classes D and E are disregarded.

Subnet Mask (SM)

Note:

Classes D and E do not utilize subnet masks.

Guide to IP Subnetting

Rules:

2^n >= number of networks
Where n is the number of borrowed bits for subnetting.
New subnet mask = default subnet mask of the class + number of borrowed bits.
Jump size = 2^m.
Where m is the remaining bits after borrowing. m = 32 - New host bit count.

Example: Subnet IP 192.168.1.0 into 6 networks

Let's calculate: 2^n>=6 so n=3

=> New SM: 255.255.255.128 or /27

Initial IP: 192.168.1.0/27

Jump size: m=32-27=5 => 2^5=32

The following IPs are in sequence:

172.168.1.32/27

172.168.1.64/27

172.168.1.96/27

172.168.1.128/27

172.168.1.160/27

We hope that with the Classful IP Subnet IP division method, you can easily subnet IP addresses for your network configuration. Additionally, if you wish to assign static IP addresses, you can refer to the article we have provided.

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