CIDR Calculator
Analyze and understand Classless Inter-Domain Routing (CIDR) notations with this powerful and intuitive tool. Instantly get network range, usable IPs, and more.
Classless Inter-Domain Routing (CIDR) is the modern standard for representing IP addresses and their associated routing prefix. It replaced the older, classful system of network addressing (Class A, B, C). CIDR notation is compact and flexible, written as an IP address followed by a forward slash and a prefix number, like 192.168.1.0/24.
Why is CIDR Important?
CIDR's primary benefit is its efficiency in allocating IP addresses. It allows network administrators to create address blocks of any size, significantly slowing the exhaustion of IPv4 addresses. It also enables route summarization, where multiple routing prefixes can be combined into a single, more general supernet route. This reduces the size of routing tables on routers across the Internet, improving performance and scalability.
How to Use the CIDR Calculator
Our tool deciphers CIDR notation instantly.
- Enter the CIDR Address: Input the full CIDR notation, such as
10.50.0.0/22. - Calculate: Press the "Calculate" button.
- Analyze the Results: The tool will provide a detailed breakdown, including the Network Address, Subnet Mask, Usable Host Range, and Broadcast Address. This is crucial for configuring network devices and firewalls. Explore other tools like our Wildcard Mask Calculator for ACL configurations.