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.
Look up details of IPv4 subnets and CIDR blocks.
Look up DNS records for a hostname like 'example.com'.
Look up security of websites, including TLS/SSL certificates.
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 calculators, utilities, and Application Programming Interfaces (APIs) for:
We love the tools we provide and hope you do, too.
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