Tools - NetworkCalc

Tools to simplify the way you manage and monitor your domains, websites, and networks.

The tools below are FREE for unlimited use. To get access to more tools and functionality, subscribe to NetworkCalc Pro.

Online Subnet Calculator

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Use CIDR notation to quickly look up details of IPv4 subnets and CIDR blocks.

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Look up DNS records for a hostname like 'example.com'.

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Look up security of websites, including SSL and TLS certificates.

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

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

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Look up your IP address that is used publicly.

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Convert between binary, octal, decimal, and hexadecimal.

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