IP Subnet Calculator
Calculate IPv4 network details, ranges, and binary information instantly.
Binary Representation (Click to expand)
📝 Calculation Details
- IP Class: Determined by the first octet.
- Private Range: Checked against RFC 1918.
- Host bits: 8 (2^8 – 2 = 254 hosts).
IP Subnet Calculator – Free Online IPv4 Subnetting Tool
Free IP Subnet Calculator to calculate IPv4 network address, subnet mask, CIDR, broadcast address, usable IP range, and binary details instantly. Built for network engineers and students.
Introduction
The IP Subnet Calculator is a fast, accurate, and easy-to-use online tool designed to help you calculate IPv4 subnet details in seconds. Whether you are a network engineer, system administrator, IT student, or cybersecurity professional, this tool simplifies subnetting by providing instant and reliable results.
With support for CIDR notation, subnet masks, network ranges, and binary representation, this calculator removes the complexity of manual subnet calculations.
No registration. No downloads. Completely free.
What Is an IP Subnet?
An IP subnet is a logical division of an IP network that improves performance, security, and network management. Subnetting allows administrators to break large networks into smaller, more efficient segments.
Subnetting is commonly used to:
- Reduce network congestion
- Improve security and isolation
- Optimize IP address usage
- Simplify network management
Key Features of IP Subnet Calculator
- 🌐 IPv4 Network Calculation: Instantly calculate network details for any IPv4 address.
- 🔢 CIDR & Subnet Mask Support: Use CIDR notation (e.g., /24) or standard subnet masks (e.g., 255.255.255.0).
- 📡 Network & Broadcast Address: Automatically identifies the network address and broadcast address.
- 📍 Usable IP Range: Displays the first and last usable IP addresses for hosts.
- 🧮 Total & Usable Hosts: Shows the total number of IPs and how many are usable.
- 🧠 Binary Representation: View IP addresses and subnet masks in binary format for learning and analysis.
- ⚡ Fast & Accurate Results: Get instant calculations with no page reloads.
- 🔒 Privacy-Friendly: All calculations are done locally in your browser — no data is stored.
How to Use IP Subnet Calculator
- Enter an IPv4 address (e.g., 192.168.1.10)
- Choose subnet input: CIDR notation (e.g., /24), or Subnet mask (e.g., 255.255.255.0)
- Adjust CIDR slider if needed
- Click Calculate Subnet
- View complete subnet details instantly
Information You Get After Calculation
The base address of the network.
The address used to send data to all hosts.
Compact representation of the IP address and mask.
The first assignable IP in the range.
The last assignable IP in the range.
Total number of IPs in the network.
How many devices can be connected.
Binary representation for analysis.
Who Should Use This Tool?
Benefits of Using an Online Subnet Calculator
Manual subnetting is time-consuming and error-prone. This tool helps you:
- Avoid calculation mistakes
- Save time during network planning
- Understand subnet structure visually
- Improve accuracy in real-world deployments
Frequently Asked Questions (FAQ)
Yes, it is completely free with no usage limits.
Currently, this tool supports IPv4 subnet calculations only.
Yes. CIDR notation (e.g., /16, /24) is fully supported.
No. All calculations happen in your browser and are never saved.
Yes. The calculator is fully responsive and mobile-friendly.
Yes. CIDR notation (e.g., /16, /24) is fully supported.
Start Calculating Subnets Instantly
Enter your IPv4 address, select subnet mask or CIDR, and calculate everything you need in one click.