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Network Mask Structure (Subnet Mask Explained)

What is a Network Mask?

A network mask (subnet mask) helps divide an IP address into two parts:

  1. Network portion – Identifies the network.
  2. Host portion – Identifies a specific device within the network.

Structure of a Subnet Mask

A subnet mask is a 32-bit number (like an IPv4 address) written in dotted decimal notation (e.g., 255.255.255.0).

It consists of:

  • 1s (network part) – Defines the network.
  • 0s (host part) – Defines individual devices within the network.

Example: IP Address and Subnet Mask

  • IP Address: 192.168.1.10
  • Subnet Mask: 255.255.255.0

Binary Representation:

IP Address:    11000000.10101000.00000001.00001010  (192.168.1.10)
Subnet Mask:   11111111.11111111.11111111.00000000  (255.255.255.0)
  • Network Portion: 192.168.1. (First 3 octets)
  • Host Portion: 10 (Last octet)

👉 Devices in the 192.168.1.0/24 network will have IPs like: 192.168.1.1, 192.168.1.2, ... 192.168.1.254 (Total 254 devices).

Types of Subnet Masks

Subnet Mask CIDR Notation No. of Hosts Example Network
255.0.0.0 /8 16,777,214 10.0.0.0/8
255.255.0.0 /16 65,534 172.16.0.0/16
255.255.255.0 /24 254 192.168.1.0/24

Why is the Subnet Mask Important?

  1. Defines the network size – Determines how many devices can exist within the network.
  2. Helps routers understand IP routing – Routers use subnet masks to direct traffic.
  3. Enhances security – Supports network segmentation, reducing unnecessary communication.

Conclusion

Understanding subnet masks is essential for effective network management. Proper subnetting enhances resource allocation, security, and performance.