What is CIDR & Subnet Calculator?
From CIDR notation such as 192.168.0.0/24, calculate the network address, broadcast address, subnet mask, wildcard mask, and the usable host range and count. It can also list the subnets you get by splitting at a smaller size.
How to use
- 1
Enter an IP address/prefix (e.g. 10.0.0.0/16).
- 2
Review the network details.
- 3
Choose a split size to list the resulting subnets.
Use cases
Designing a VPC
Split a cloud network into subnets.
Firewall rules
Check that an allowed IP range is what you expect.
FAQ
Is my data saved or sent anywhere?+
No. Everything is calculated in your browser and nothing is saved or sent.