NETWORKING TOOL

IPv4 CIDR Calculator

Calculate network ranges, subnet masks, usable hosts and broadcast addresses directly in your browser.

IPv4 address with CIDR prefix

Calculation runs locally in your browser. The entered address is not sent to Runbookery.

Quick example

192.168.1.0/24

A /24 contains 256 IPv4 addresses; traditionally 254 are usable hosts.

/31: two addresses, commonly used for point-to-point links.
/32: one address, commonly used as a host route.