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Networking Tools Subnet / CIDR Calculator
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Networking Tools

Network calculation utilities for developers and system administrators. Calculate subnets, CIDR ranges, and IP address details instantly.

Subnet / CIDR Calculator

Calculate subnet details from any IP address and CIDR prefix. View network, broadcast, host range, and masks.

Available Networking Tools

  • Subnet / CIDR Calculator — calculate subnet details from any IP address and CIDR prefix, view network, broadcast, host range, and masks

Understanding Subnets and CIDR

Every device on an IP network has an address, and a subnet defines which range of addresses belong to the same local network. CIDR notation (Classless Inter-Domain Routing) is the modern shorthand for describing that range: 192.168.1.0/24 means the first 24 bits are the network portion, leaving the remaining 8 bits — 256 addresses — for hosts. Getting this maths right matters because an incorrect mask can silently break routing, firewall rules, or VPC peering.

A subnet calculator removes the guesswork. Instead of converting between binary, dotted-decimal, and prefix length by hand, you enter an address and prefix and immediately see the network address, broadcast address, usable host range, total host count, wildcard mask, and subnet mask.

When You Need a Subnet Calculator

  • Planning a network or VPC: work out how many subnets and hosts a given prefix gives you before allocating address space in AWS, Azure, or GCP.
  • Writing firewall or ACL rules: confirm the exact address range a CIDR block covers so a rule isn't accidentally too broad or too narrow.
  • Debugging connectivity: check whether two addresses actually sit in the same subnet when traffic isn't routing as expected.
  • Studying for certifications: verify your manual subnetting answers when preparing for networking exams.

Use the Subnet / CIDR Calculator for any of the above. All calculations run locally in your browser — no addresses or network details are ever transmitted.

Other Developer Tools

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Frequently Asked Questions

What networking tools does CodeTidy offer?
CodeTidy provides a subnet and CIDR calculator that computes network addresses, broadcast addresses, host ranges, and subnet masks from any IP address and prefix length. More networking tools are planned for the future.
How does the subnet calculator work?
Enter an IP address with a CIDR prefix (like 192.168.1.0/24) and the calculator instantly shows the network address, broadcast address, first and last usable hosts, total hosts, wildcard mask, and subnet mask. All calculations run in your browser.
Does my IP address get sent to any server?
No. All networking calculations happen entirely in your browser using client-side JavaScript. No IP addresses or network information are transmitted to any server.
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