NetworkCalc is Ad-Free | What Changed and Why
NetworkCalc is now ad-free and runs on the support of people like you
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Effortlessly Monitor and Manage Your Networks and Domains
Free network tools & APIs — no account, no paywall.
Simple, reliable tools to keep your networks and domains running smoothly.
Try the tools and sign up for Network Buzz, our monthly newsletter
Network Tools and Calculators
A wide range of network calculators to help you make calculations quickly at your desk or in the field.
Online Subnet Calculator
Use CIDR notation to quickly look up details of IPv4 subnets and CIDR blocks.
DNS Tools
Look up DNS records for a hostname like 'example.com'.
DNS Tools
Security Tools
Look up security of websites, including SSL and TLS certificates.
DNS Tools
Binary Converter
Convert between binary, octal, decimal, and hexadecimal.
DNS Tools
API Documentation
Calculator APIs for making calculations from your favorite command-line tool or integrating custom software.
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About NetworkCalc
NetworkCalc provides a comprehensive suite of online tools and APIs for building, managing, and monitoring networks. Our easy-to-use platform includes powerful features like subnet calculation, domain monitoring, and network management, with built-in capabilities for integration into your own applications or use with our streamlined web interface.
NetworkCalc is independently built and actively maintained. It's free to use, with no paid tiers, and kept running through the support of people who find it useful. If NetworkCalc has saved you time, consider supporting the project.
Use your favorite command-line tools or programming languages to interface with NetworkCalc:
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•Bash
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•PowerShell
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•Command Prompt
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•Terminal
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•Python
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•JavaScript
See how the Subnet API makes subnet calculation and troubleshooting easy from the command line:
