IP Subnet Calculator
The top network subnet calculator for professionals. Instantly calculate subnet masks, network addresses, and usable ranges. Fast, accurate, and 100% confidential visual subnet calculator.
Host Information
Network Details
Binary Visualization
The Best Free Subnet Mask Calculator
Welcome to the top-rated IPv4 subnetting calculator. Designed for network engineers, students, and IT administrators, this tool is Top, Fast, Best, and Lifetime Free Unlimited. We prioritize your privacy your information is 100% confidential and secure because all processing happens locally on your device.
Why this is the ultimate Network Subnet Calculator
Visual Subnet Calculator
Visualize binary bits (0s and 1s) to understand how the subnet mask interacts with the IP address.
Subnetting IP Calculator
Effortlessly split networks. Convert CIDR to masks and calculate usable ranges instantly.
Calculator Subnet Precision
Eliminate human error. Our algorithm adheres to RFC standards for 100% accuracy.
Global Reliability
Trusted by professionals in USA, UK, India, EU, and Australia. The logic works everywhere.
100% Secure & Private
No data is sent to the cloud. Your network topology remains private on your machine.
Lifetime Free Unlimited
No subscriptions, no limits. Use this subnet calculator as many times as you need.
Popular uses worldwide
Network design
Plan IPv4 subnets for offices, data centers, and on-prem networks with precise host counts.
Cloud VPC/VNet
Create clean subnets for AWS VPC, Azure VNet, and Google Cloud VPC deployments.
Security & ACLs
Get wildcard masks for firewall and router ACLs with confidence.
Education & Exams
Perfect for CCNA/CompTIA subnetting practice: classes, masks, and binary breakdowns.
Troubleshooting
Verify if an IP is private/public and confirm address ranges quickly.
Automation
Use predictable CIDR blocks while scripting or building infra-as-code.
Note: Always follow your organization’s IP addressing policies and RFC guidelines.
How to Calculate Subnet from IP Address
Many users ask how to calculate subnet from IP address or how to subnet mask calculation works. Here is the simplified process used by our calculator:
- Identify the IP and CIDR: Start with an IP (e.g., 192.168.1.10) and a prefix (e.g., /24).
- Convert to Binary: Transform both the IP address and the Subnet Mask into binary format.
- Perform Bitwise AND: Compare the IP binary and Mask binary. If both bits are 1, the result is 1. Otherwise, it is 0.
- Result: The output of the AND operation is your Network Address. The inverted bits give you the Wildcard Mask.
Use our tool above to automate this ipv4 subnetting calculator process instantly!
Global Standards (GEO Optimized)
Whether you are configuring Cisco routers in the USA, setting up Juniper firewalls in the UK, managing cloud VPCs in India, or designing networks in Europe or Australia, our Subnet Mask Calculator follows universal IPv4 standards. It is the perfect tool for the CCNA exam, CompTIA Network+, and real-world network engineering globally.
CIDR Reference Chart
| CIDR | Subnet Mask | Hosts | Wildcard |
|---|---|---|---|
| /24 | 255.255.255.0 | 254 | 0.0.0.255 |
| /25 | 255.255.255.128 | 126 | 0.0.0.127 |
| /26 | 255.255.255.192 | 62 | 0.0.0.63 |
| /27 | 255.255.255.224 | 30 | 0.0.0.31 |
| /28 | 255.255.255.240 | 14 | 0.0.0.15 |
| /29 | 255.255.255.248 | 6 | 0.0.0.7 |
| /30 | 255.255.255.252 | 2 | 0.0.0.3 |
| /32 | 255.255.255.255 | 1 | 0.0.0.0 |
Frequently Asked Questions
How do I use this calculator subnet tool?
Simply enter your IPv4 address and your mask (e.g., 24 or 255.255.255.0). Click calculate to see the visual subnet breakdown.
Is this a visual subnet calculator?
Yes. We provide a binary representation section that helps you visually align bits for subnetting practice.
How to calculate subnet mask manually?
Subnet mask calculation involves setting network bits to 1 and host bits to 0. Our tool automates this instantly.
Is my data secure?
Absolutely. 100% confidential. We do not store your IP addresses; the math runs inside your browser.
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