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Tools/Addressing/IPv4 subnet calculator

IPv4 subnet calculator

runs in your browser

Calculator, splitting, VLSM, route aggregation and conversions.

More toolsIPv6 subnet calculator DNS lookup SSL/TLS checker DNSBL blacklist check E-mail: SPF, DKIM, DMARC

Tools

Addressing

Domains and certificates

Internet

Server-side diagnostics

Content

Information

Where the data comes from

Calculators run in your browser. DNS, whois and BGP use public services, and the tests marked “server” (SSL/TLS, ports, traceroute, MTU, DNSBL) run from the routing.pl server.