Subnet Calculator
Calculate network subnets, IP ranges, and network information for network administration. Enter an IP address and subnet mask to get all details instantly.
About Subnet Calculators
A subnet calculator is an essential tool for network engineers, administrators, and anyone working with IP networks. It helps you quickly determine network address, broadcast address, usable host range, and other critical information based on an IP address and subnet mask. Subnetting is the process of dividing a network into smaller, more manageable segments, improving performance, security, and organization. Understanding subnetting is crucial for designing scalable and efficient networks, troubleshooting connectivity issues, and ensuring proper allocation of IP resources.
This tool supports both CIDR (Classless Inter-Domain Routing) and traditional decimal subnet masks, making it versatile for modern and legacy network designs. Whether you are preparing for a certification exam, planning a new network, or managing an existing one, a subnet calculator saves time and reduces errors.
How This Tool Works
The Subnet Calculator takes your input IP address and subnet mask (in CIDR or decimal format) and instantly computes all relevant network details. It converts the subnet mask to binary, applies it to the IP address to find the network and broadcast addresses, and calculates the range of usable host addresses. The tool also determines the network class, IP type (public, private, loopback, etc.), and provides a wildcard mask for advanced configurations. All calculations are performed in your browser for privacy and speed.
The results are displayed in a clear, organized format, making it easy to copy or reference for documentation, configuration, or troubleshooting.
Key Features
- Supports CIDR and Decimal Masks: Enter subnet masks in either format for maximum flexibility.
- Instant Calculations: Get all network details as soon as you enter your data.
- Comprehensive Output: See network address, broadcast address, host range, subnet mask, wildcard mask, and more.
- Network Class & IP Type Detection: Instantly know if your IP is public, private, loopback, or reserved.
- Mobile Friendly: Fully responsive design for use on any device.
- Privacy First: All calculations are performed locally in your browser.
- Educational: Great for learning subnetting concepts and preparing for networking exams.
- Accessibility: Designed for keyboard navigation and screen readers.
These features make the Subnet Calculator a must-have for IT professionals, students, and anyone working with IP networks.
Common Use Cases
- Network Design: Plan and allocate subnets for new networks or expansions.
- Troubleshooting: Quickly identify network and broadcast addresses to resolve connectivity issues.
- Certification Prep: Practice subnetting for exams like CCNA, CompTIA Network+, and more.
- Documentation: Generate accurate network details for technical documentation.
- Security: Segment networks for improved security and access control.
- IP Management: Track and allocate IP ranges efficiently.
No matter your role, this tool streamlines subnetting tasks and helps you avoid costly mistakes.
Step-by-Step Guide
- Enter the IP Address: Type the base IP address of your network (e.g., 192.168.1.0).
- Select Mask Type: Choose between CIDR or Decimal notation for the subnet mask.
- Input Subnet Mask: Enter the prefix length (e.g., /24) or the decimal mask (e.g., 255.255.255.0).
- Click Calculate: Press the "Calculate" button to see all network details instantly.
- Review Results: Use the output for configuration, documentation, or troubleshooting.
- Clear All: Use the "Clear All" button to reset and try different scenarios.
For best results, double-check your input values. The calculator will alert you if the IP address or subnet mask is invalid.