EasyConvert / API & Network

Subnet & CIDR IP Calculator

Calculate IP subnet mask, broadcast address, CIDR range, and usable host count. Free browser-based tool with no signup required.

About Subnet & CIDR IP Calculator

Calculate IP subnet mask, broadcast address, CIDR range, and usable host count.

This network tool sends requests to the destination selected by the user. Do not submit secrets you do not intend to send.

How to use this tool

  1. Enter or select the ip address, cidr mask value you want to work with.
  2. Review the available settings, then run the calculate action.
  3. Review the network address, broadcast address, usable ip range output and use the copy or download action when the tool provides one.

What you can do with Subnet & CIDR IP Calculator

  • Calculate subnet range
  • Find broadcast ip
  • Calculate cidr block

What this conversion does

Calculate network address, broadcast address, netmask, and usable host range from an IP address and CIDR prefix.

Example input

192.168.1.130/26

Example output

Network 192.168.1.128, broadcast 192.168.1.191, netmask 255.255.255.192, 62 usable hosts

Practical workflow

  1. Enter an IPv4 address with its CIDR prefix (or pick the prefix separately).
  2. Read the computed network address, broadcast address, netmask, and wildcard mask.
  3. Use the usable host range to plan address assignments.

Common use cases

  • Plan VPC or LAN subnets and confirm how many hosts fit each prefix.
  • Check whether two IP addresses share a subnet.
  • Translate between CIDR prefixes and dotted netmasks while writing firewall rules.

Important notes and limitations

  • Calculations follow standard IPv4 rules where the network and broadcast addresses are reserved, so usable hosts are 2^(32-prefix) minus 2 for prefixes up to /30.
  • All computation is local; IP addresses you enter are not transmitted.

Continue your workflow

Frequently asked questions

How many usable hosts does a /26 subnet have?

62. A /26 leaves 6 host bits (64 addresses), minus the network and broadcast addresses. The calculator shows this instantly for any prefix, along with the exact usable range.

What is the difference between netmask and wildcard mask?

The netmask marks the network bits (255.255.255.192 for /26); the wildcard mask is its inverse (0.0.0.63) and is used in ACL syntax on some routers. The calculator shows both.

Does the calculator send my IP ranges anywhere?

No. Everything is computed locally in your browser, so internal network layouts stay private.

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