What is CIDR notation?
CIDR notation represents an IP address and subnet mask using a suffix such as /24.
Developer
IPv4 Subnet Calculator
Calculate subnet masks, network addresses, broadcast addresses and usable hosts for IPv4 networks.
Tool
IPv4 Subnet Calculator
Calculate subnet masks, network addresses, broadcast addresses and usable hosts for IPv4 networks.
This tool runs in your browser. Your input is processed locally and is not uploaded.
About this Tool
Use this free IPv4 subnet calculator to determine subnet masks, CIDR ranges, network addresses, broadcast addresses and available host counts for IPv4 networks.
Examples
- 192.168.1.0/24
- 10.0.0.0/16
- 172.16.10.0/27
Frequently Asked Questions
What is a broadcast address?
A broadcast address is used to send packets to all hosts within a subnet.
Can host ranges be calculated?
Yes. The calculator can determine the first and last usable IP addresses.