What is CIDR notation?
CIDR notation combines an IP address with a prefix length that identifies how many leading bits belong to the network.
Security
Subnet Calculator
Calculate network address, broadcast address, host range, CIDR and subnet details.
Tool
Subnet Calculator
Calculate network address, broadcast address, host range, CIDR and subnet details.
This tool runs in your browser. Your input is processed locally and is not uploaded.
About this Tool
Use this subnet calculator to determine network boundaries, usable IPv4 host ranges, subnet masks, wildcard masks and total address counts. IPv4 and IPv6 calculations run entirely in your browser.
Examples
- 192.168.1.10/24
- 10.0.0.1/8
- 2001:db8::1/64
Frequently Asked Questions
Does IPv6 have a broadcast address?
No. IPv6 uses multicast instead of a traditional broadcast address.
Are network requests performed?
No. The tool only calculates values from the entered addresses.