Static example
192.168.1.25/24 belongs to network 192.168.1.0/24, whose broadcast address is 192.168.1.255. Private examples are safe for learning; the calculator runs entirely in your browser.
What a CIDR calculator does
It converts IPv4 CIDR notation into network boundaries, subnet mask, wildcard mask, address count and usable-host range. No entered address is sent to our server.
Why CIDR matters
Classless Inter-Domain Routing uses a prefix length such as /24 to describe how many leading bits identify the network. A longer prefix creates a smaller address block; a shorter prefix creates a larger one.
Operational note
For /31 point-to-point networks and /32 host routes, the traditional network/broadcast host rules differ. The calculator reports both addresses as usable for /31 and the single address for /32.