What is IP Subnet Calculator?
Computes IPv4 network ID, wildcard mask, and host capacity for network architecture.
How to Use This Calculator
- Enter IP and select CIDR prefix.
The Mathematical Formula & Variables
Hosts = 2^(32 - CIDR) - 2
Step-by-Step Worked Example
Scenario: 10.0.0.45/24.
- Network = 10.0.0.0, Broadcast = 10.0.0.255, Usable = 10.0.0.1 - 10.0.0.254.
Result: 254 Hosts
Frequently Asked Questions
What is a wildcard mask?
A wildcard mask is the bitwise inverse of the subnet mask, used in Cisco access control lists (ACLs).