What does a subnet calculator show?

It shows the network address, broadcast address, subnet mask, wildcard mask, usable host range, and host count derived from the IP address and mask or prefix you enter.

Can I use CIDR notation instead of a dotted mask?

Yes. You can enter a prefix such as /24 or just 24, and the calculator converts it into the matching subnet mask automatically.

Why are /31 and /32 special cases?

A /31 is commonly used for point-to-point links and effectively has two usable addresses, while a /32 represents a single host route with no broader host range. They do not behave like typical multi-host subnets.

What is a wildcard mask?

A wildcard mask is the inverse of the subnet mask. It is often used in ACLs and device configuration where matching logic relies on which bits can vary.

Does this subnet calculator support IPv6?

No. This tool is scoped to IPv4 only. IPv6 subnetting has different address formats and conventions.

Subnet Calculator

Calculate IPv4 subnet details from an address and subnet mask or prefix with network address, broadcast address, usable host range, wildcard mask, and binary views. Perfect for network planning, router configuration, and infrastructure debugging.

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Examples for subnet calculator workflows

IPv4 Input & Settings

Enter an IPv4 address and subnet mask to calculate the derived network details and host range.

IPv4 Address

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Subnet Mask or Prefix

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How it works: This calculator combines an IPv4 address with a subnet mask or prefix, then derives the network range, broadcast address, usable host span, wildcard mask, and binary representations locally in your browser.

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