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IP Subnet Calculator

IP Subnet Calculator turns an IPv4 address and prefix into everything you need for network planning: network and broadcast addresses, the usable host range and counts, dotted and binary subnet masks, the wildcard mask, and the address class and scope.

Última actualización: July 2026

A subnet calculator takes an IPv4 address and CIDR prefix (like 192.168.1.0/24) and derives the network and broadcast addresses, the first and last usable hosts, total and usable host counts, the subnet and wildcard masks and the IP class — including whether the address is private or public — instantly in your browser.

IP Subnet CalculatorFunciona en tu navegador

Cómo usar IP Subnet Calculator

  1. Enter an IPv4 address — pasting CIDR form like 10.0.0.0/8 works too.
  2. Pick the CIDR prefix / subnet mask if you didn't use the slash form.
  3. Read the network, broadcast, host range, masks and IP class instantly.

Preguntas frecuentes

How are usable hosts counted?

For prefixes up to /30 it's total hosts minus the network and broadcast addresses. A /31 point-to-point link has 2 usable addresses (RFC 3021) and a /32 is a single host.

How does it tell private from public?

It checks the RFC 1918 ranges (10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16), plus loopback and link-local, and labels everything else public.

Is my network data uploaded?

No. All subnet math runs locally in your browser — addresses you enter are never sent to a server.

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