Subnet Calculator
IPv4 subnet calculator: enter an IP address and CIDR prefix to get the network address, broadcast address, subnet mask, usable host range, and host count.
About the Subnet Calculator
CIDR notation (e.g. 192.168.1.0/24) compactly describes a network and how many host addresses it contains. The /n is the number of leading bits that identify the network — the remaining 32 − n bits address hosts within it.
This calculator parses the IP and CIDR, then shows you everything you need to configure a router, plan an address scheme, or document a network.
Frequently asked questions
More other calculators
Age Calculator
Calculate exact age in years, months, and days.
Date Calculator
Add, subtract, and compare dates with ease.
Time Calculator
Add, subtract, and convert hours, minutes, and seconds.
Hours Calculator
Calculate work hours from start, end, and break.
GPA Calculator
Calculate GPA on the 4.0 scale from grades and credits.
Grade Calculator
Compute weighted course grades from assignment scores.
Concrete Calculator
Estimate concrete volume and bags for slabs, footings, and columns.
Password Generator
Create strong, random passwords with custom rules.
Conversion Calculator
Convert length, weight, temperature, and volume units.