Network Calculators and APIs
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.
Try the Tools
Online Subnet Calculator
DNS Tools
Security Tools
Binary Converter
Use the free APIs
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.
Get more out of NetworkCalc
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.
About NetworkCalc
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:
- Network administrators
- System administrators
- Email administrators
- Information Technology support
- Home network users
- Students
Try the network tools and remember to bookmark and share your favorites:
- Use the online subnet calculator to calculate the details of an IP address or CIDR block.
- Use the DNS tools to check DNS configuration on your website or look up DNS on another website.
- Use the security tools to retrieve the SSL or TLS certificate on your website.
- Use the binary converter to convert numbers between binary, octal, decimal, and hexadecimal.