Subnet Mask Calculator
"Free Subnet Mask Calculator helps you compute network and broadcast addresses, CIDR prefixes, and usable host ranges for IPv4 addresses. Enter an IP and mask to get subnet details instantly — simple, accurate, and no login required."
🌐 Subnet Mask Calculator — Network & Host Calculation Made Easy
Welcome to the Free Subnet Mask Calculator on calculator.cl! This tool helps you analyze and calculate key subnet information for IPv4 networks, such as network address, broadcast address, subnet mask in dotted-decimal format and CIDR notation, and the number of usable host addresses.
Whether you’re configuring a home network, planning IP allocations for an enterprise, or studying networking fundamentals, this calculator gives accurate results instantly — no signup or login needed.
🧠 What Is a Subnet Mask?
A subnet mask is a binary bitmask used to divide an IPv4 address into the network and host portions. The ones (1s) represent the network part, while the zeros (0s) represent host addresses.
For example, the mask 255.255.255.0 in dotted-decimal corresponds to 11111111.11111111.11111111.00000000 in binary — meaning the first 24 bits identify the network and the last 8 bits are for hosts.
Using subnet masks allows devices to understand which part of an IP address refers to a local network and which part refers to an individual device.
🧮 How the Calculator Works
To use the Subnet Mask Calculator:
Enter an IPv4 address (for example, 192.168.1.10).
Enter a subnet mask or CIDR prefix (for example, /24 or 255.255.255.0).
Click Calculate.
The tool will show:
Network address — the identifiable subnet block
Broadcast address — the address used to communicate with all hosts
Subnet mask in dotted-decimal and CIDR formats (/n)
Total usable host addresses in the subnet
Host range — first and last usable IPs
This makes understanding networks easier, whether for practical use or learning.
📊 Why Use This Tool
Subnet calculations can be tricky because they involve binary math and bit manipulation. Using this calculator saves time and eliminates errors, especially when planning networks or troubleshooting connectivity.
Here’s how it helps:
⚙️ Network design — choose appropriate subnet sizes
📡 IP planning — ensure enough host addresses
📘 Learning & exams — understand CIDR and subnetting concepts
🔧 Troubleshooting — find broadcast and network addresses easily
📍 Tips for Accurate Results
Use CIDR notation (/n) if you know it — it’s simpler and widely used in networking.
Always verify that your subnet mask matches your number of required hosts and networks.
If you’re studying networking, combine this tool with subnetting practice exercises for mastery.
⚠️ Important Notes
This tool focuses on IPv4 subnet calculations. IPv6 subnetting works differently and uses 128-bit prefixes.
Calculations assume valid IPv4 formats and correct subnet mask entries.
TO USE THIS TOOL VISIT https://calculator.cl/subnet-mask-calculator/ OR SCAN THIS QR CODE
