IP Subnet Calculator
IP Subnet
Calculate subnet mask, host count, and address range.
Formula
Usable Hosts = 2^(32 - CIDR) - 2
Frequently Asked Questions
What is CIDR notation?
CIDR notation like /24 defines how many bits are used for the network.
How many hosts in a /24 subnet?
A /24 subnet has 254 usable host addresses.