What Is CIDR and Why Use a CIDR Calculator?

CIDR, or Classless Inter-Domain Routing, is a method used to allocate IP addresses and manage routing efficiently. It replaced the older class-based IP system and allows more flexible subnetting and IP range assignment.

If you're a network engineer, developer, or student dealing with subnetting or IP addresses, CIDR notation can seem confusing. That’s why CIDR.site offers a free, easy-to-use CIDR calculator to simplify your workflow.

What Is a CIDR Calculator?

A CIDR calculator helps you:

• Convert CIDR notation like /24 into IP address ranges

• Calculate subnet masks and broadcast addresses

• Determine the number of usable hosts in a block

• Visualize the network layout clearly

At CIDR.site, our CIDR calculator delivers instant and accurate results — no signups, no ads, just networking tools that work.

Example: How CIDR Works

Given a CIDR block like 192.168.1.0/24, our calculator will display:

• IP Range: 192.168.1.0 – 192.168.1.255

• Subnet Mask: 255.255.255.0

• Broadcast Address: 192.168.1.255

• Total Hosts: 256 (254 usable)

Why Choose CIDR.site?

• 100% Free: No hidden costs or logins.

• Multi-Tool Platform: From subnet calculations to IP ranges.

• Fast & Lightweight: Designed for speed and simplicity.

• Multi-language Support: Automatically serves localized versions for global users.

Who Should Use CIDR.site?

Whether you’re a:

• Network administrator

• Cloud/DevOps engineer

• Cybersecurity analyst

• IT student learning subnetting

…CIDR.site gives you the tools you need to calculate and understand IP addresses and networks.

Try the CIDR Calculator Now

Launch CIDR Calculator – Convert CIDR to IP ranges, get subnet info, and plan your network fast.

Related Tools on CIDR.site

• IP Address Calculator

• Subnet to IP Range Converter

• CIDR Notation Guide

• CIDR Block Calculator

Final Thoughts

CIDR and subnetting don’t have to be difficult. With CIDR.site, you get powerful networking tools without the complexity. Whether you're planning a home lab or configuring enterprise networks, we’ve got you covered.

No signups. No noise. Just pure IP math.

📩 Have feedback or suggestions? Contact us — we’re always listening.