Free IP Subnet Calculator

Professional subnetting tool for network engineers and administrators. Calculate subnet masks, network addresses, broadcast addresses, and host ranges instantly. The most accurate and reliable subnet calculator online.

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Professional Subnet Calculator & Network Tools

IP Subnet Calculator

Professional subnet calculator for network planning and management. Calculate subnet masks, network addresses, broadcast addresses, and host ranges with precision. The most accurate subnetting tool for network engineers and administrators.

  • Subnet mask calculation
  • Network address determination
  • Broadcast address calculation
  • Host range calculation
  • CSV export functionality
  • Column visibility controls
Launch Calculator

Subnet Wizard

Plan your network by specifying subnet names, host requirements, and base network. Generate optimized subnet configurations and direct links to your subnet calculator.

  • Network planning wizard
  • Subnet name management
  • Host requirement calculation
  • Automatic mask calculation
  • Direct calculator integration
  • Professional interface
Launch Wizard

Option 43 Generator

Generate DHCP Option 43 for Cisco WLC provisioning, EWC conversion, Catalyst to Meraki migration, and vendor-specific DHCP options. Essential for network administrators configuring complex DHCP environments.

  • Cisco WLC provisioning (f1xxx)
  • EWC conversion (f2xxx)
  • Catalyst to Meraki migration (f3xxx)
  • TFTP server configuration
  • Bidirectional conversion
  • Professional interface
Launch Generator

Type 7 Password Decryptor

Decrypt Cisco Type 7 encrypted passwords instantly. Essential tool for network administrators working with legacy Cisco devices and configurations.

  • Instant Type 7 decryption
  • Multiple example passwords
  • Copy-to-clipboard functionality
  • Input validation
  • Error handling
  • Professional interface
Launch Decryptor

Nmap Command Maker

Build professional nmap scanning commands with our intuitive GUI. Select scanning options, scripts, and parameters to generate accurate nmap commands for network security testing.

  • Scan type selection
  • Port range configuration
  • Timing and performance options
  • NSE script selection
  • Output format options
  • Professional interface
Launch Command Maker
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What is a Subnet Calculator?

A subnet calculator is an essential tool for network engineers and administrators that helps calculate subnet masks, network addresses, broadcast addresses, and host ranges.

Our IP Subnet Calculator provides:

  • Subnet Mask Calculation: Determine the correct subnet mask for your network requirements
  • Network Address Calculation: Find the network address for any given IP and subnet mask
  • Broadcast Address Calculation: Calculate the broadcast address for your subnet
  • Host Range Calculation: Determine the usable host range within your subnet
  • CIDR Notation Support: Work with Classless Inter-Domain Routing notation
  • Professional Export: Export results to CSV and Excel formats
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Network Planning Made Easy

Perfect for network administrators, engineers, and IT professionals

Why Choose Our Tools?

Secure & Private

All calculations and decryptions happen locally in your browser. No data is sent to our servers, ensuring complete privacy and security.

Fast & Efficient

Optimized algorithms provide instant results. No waiting time, no server delays - just fast, accurate network calculations.

Mobile Friendly

Responsive design works perfectly on all devices - desktop, tablet, and mobile. Access your network tools anywhere, anytime.

Frequently Asked Questions About Subnet Calculators

A subnet calculator is a network tool that helps network engineers and administrators calculate subnet masks, network addresses, broadcast addresses, and host ranges. It works by taking an IP address and subnet mask as input, then performing binary calculations to determine the network boundaries and available host addresses within that subnet.

Subnet calculators are essential for network planning because they help you determine the optimal subnet mask for your network requirements, calculate the number of available host addresses, and ensure proper network segmentation. This is crucial for efficient IP address allocation and network security.

Our IP subnet calculator is designed with precision in mind, using industry-standard algorithms for all calculations. It provides accurate results for subnet masks, network addresses, broadcast addresses, and host ranges, making it a reliable tool for professional network administration.

Yes! Our subnet calculator supports both CSV and Excel export functionality. This allows you to save your subnet calculations for documentation, network planning reports, or sharing with team members. The export feature is particularly useful for network administrators who need to maintain detailed records.

Absolutely! Our IP subnet calculator is completely free to use with no registration required. We believe that professional network tools should be accessible to all network engineers and administrators, which is why we provide this subnet calculator free of charge.