What does CIDR stand for?
CIDR stands for Classless Inter-Domain Routing and is used to describe IP address ranges.
Developer
CIDR Calculator
Calculate CIDR ranges, subnet masks, network addresses and host counts instantly.
Tool
CIDR Calculator
Calculate CIDR ranges, subnet masks, network addresses and host counts instantly.
This tool runs in your browser. Your input is processed locally and is not uploaded.
About this Tool
Use this free CIDR calculator to analyze IP ranges, subnet masks, network addresses and host capacities. Ideal for network planning, cloud infrastructure and system administration.
Examples
- 192.168.0.0/24
- 10.10.0.0/20
- 172.20.128.0/18
Frequently Asked Questions
Why use CIDR?
CIDR enables efficient allocation of IP addresses and flexible subnetting.
Is this useful for cloud networks?
Yes. CIDR ranges are widely used in AWS, Azure, Google Cloud and private networks.