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

Try NetworkCalc's tools below. For more tools and functionality, register for an account.

Online Subnet Calculator

Look up details of IPv4 subnets and CIDR blocks.

DNS Tools

Look up DNS records for a hostname like ''.
DNS Tools

Security Tools

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

Binary Converter

Convert between binary, octal, decimal, and hexadecimal.
DNS Tools

WHOIS Lookup

Look up registration information for a domain like ''.
WHOIS Lookup

What is my IP?

Look up your IP address that is used publicly.
What is my IP