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.

Encode and decode using different encoding schemes: URL, Base64, and Base64URL.

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