Tools

NetworkCalc is a suite of network tools and APIs to help you manage your domain, website, and IPv4 networks.

The tools are free for unlimited use - try them out below. To get access to more tools and functionality, register for a NetworkCalc account.

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 SSL and TLS certificates.

Look up registration information for a domain like 'example.com'.

Validate the SPF records for a domain like 'example.com' or the syntax on a to-be-published SPF record.

Look up your IP address that is used publicly.

Convert between binary, octal, decimal, and hexadecimal.

These tools and their APIs are updated with each release of NetworkCalc. For details on changes, read the release notes.