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![cyber_rekk Avatar](https://lunarcrush.com/gi/w:24/cr:twitter::1562923373897793536.png) Mololuwa | Cybersecurity (The God Complex) [@cyber_rekk](/creator/twitter/cyber_rekk) on x 6484 followers
Created: 2025-02-25 00:59:05 UTC

🔍 Subnet Masks Explained: What They Are and How They Work🎮
(Cyber Networking Post🛜)

A subnet mask is a number that helps separate an IP address into two parts:
•🌐 Network portion – Identifies the network.
•💻 Host portion – Identifies specific devices within that network.

Think of it like an apartment address:
🏢 The network is the building (shared by many apartments).
🏠 The host is your specific apartment number.

🛠 How a Subnet Mask Works

IP addresses are XX bits long and are divided into four 8-bit sections (called octets). The subnet mask tells a device which part of the IP address belongs to the network and which part is for individual devices.

Example:
🔹 IP Address: 192.168.1.10
🔹 Subnet Mask: 255.255.255.0 (/24)

In binary, this looks like:

Decimal  |  Binary
XXX     |   11000000
XXX     |   10101000
X           |   00000001
XX        |   00001010

🔹 Subnet Mask (255.255.255.0) in Binary:
11111111.11111111.11111111.00000000

✅ The 1s represent the network portion (shared by all devices in the same subnet).
✅ The 0s represent the host portion, which can be assigned to individual devices.

So, in a /24 subnet, all devices with 192.168.1.X belong to the same network. But 192.168.2.X would be on a different network.

📌 Why Subnetting?

Subnetting divides a large network into smaller, more efficient subnets.

Example:
🔹 A /24 subnet (255.255.255.0) allows for XXX total addresses (254 usable for devices).
🔹 A /26 subnet (255.255.255.192) splits that into four smaller networks, each with XX usable addresses.

⚡ Benefits of Subnetting:

🔐 Better security – Limits access between groups of devices.
🚀 Improved performance – Reduces congestion by splitting traffic.
📊 Efficient IP allocation – Prevents wasting addresses on large unused networks.

🔑 Key Takeaways

✅ A subnet mask determines which part of an IP address belongs to the network and which part is for devices.
✅ The 8-bit octet chart helps break down IP addresses and subnet masks into binary.
✅ Subnetting creates smaller, more manageable networks within a larger one.

💡 Want to see a subnet breakdown for a specific IP? Drop it in the comments! ⬇️

! 🚀


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**Related Topics**
[ip](/topic/ip)
[cybersecurity](/topic/cybersecurity)

[Post Link](https://x.com/cyber_rekk/status/1894190344700371350)