IP Address & CIDR Calculator

Calculate IPv4 network ranges, subnet masks, and usable hosts from an address and CIDR prefix

Your input and results are processed locally in your browser and are never sent to a server.

Network details

Input CIDR	192.168.1.42/24
Subnet mask	255.255.255.0
Wildcard mask	0.0.0.255
Network address	192.168.1.0
Broadcast address	192.168.1.255
First usable address	192.168.1.1
Last usable address	192.168.1.254
Total addresses	256
Usable hosts	254
Address scope	Private

/31 is treated as a point-to-point network with two usable endpoints, while /32 is treated as a single host route.

About this tool

The IP Address & CIDR Calculator derives the subnet mask, wildcard mask, network and broadcast addresses, usable range, and host counts for an IPv4 address. Calculations run entirely in your browser.

Common use cases

Plan a private IPv4 subnet before configuring a router, firewall, or cloud network.
Verify whether an address belongs to the expected network during troubleshooting.
Check usable address ranges and host capacity when reviewing network documentation.
Practice CIDR notation and subnetting for certifications, coursework, or interviews.