Free online network calculators and APIs for home and corporate networking, presented simply.
We offer free REST APIs for system administrators, network administrators, developers, and home network users. Perform network calculations for subnets and convert between binary, decimal, hexadecimal, and octal. Verify your website DNS records, including SPF, and SSL certificates.
Access free REST APIs for all of the available tools on NetworkCalc. Detailed API documentation is available for the online subnet calculator, DNS tools, security tools, and binary converter.
Additional APIs are available if you register for a NetworkCalc account. This will allow you to save subnets and domains you work with regularly, track the configuration of your website over time, and perform queries quickly.
Save and manage your subnets.
Check up on the DNS and security configuration of your website.
Access additional APIs to integrate NetworkCalc's tools in your environment.
NetworkCalc is a suite of free online resources to help you manage your IP subnets, website security, and home or corporate networks.
We offer a variety of free online calculators, utilities, and Application Programming Interfaces (APIs) for:
Try the network tools and remember to bookmark and share your favorites: